Overview:
- Estimated achievement difficulty: 2/10 [Achievement Difficulty Rating]
- Offline: 35 [1000gs.png]
- Online: 0
- Approximate amount of time to 1000gs.png: 10 hours [Estimated Time to 100%]
- Minimum number of playthroughs needed: 1 [multiple runs of each level]
- Missable achievements: None
- Does difficulty affect achievements: No
- Unobtainable/glitched achievements: No

Introduction:
"The King of the Cosmos once accidentally destroyed all the stars in the universe. He sent his son, the Prince, to Earth and ordered him to create a large katamari.

The Prince rolled the katamari and made the katamari bigger and bigger, rolling up all the things on the earth. The katamari that he created floated in space, sparkling, and brought back the lost starry sky.

As the starry sky was restored, the King's fans gradually grew in number all over the world. The King wanted to respond to the wishes of his fans for his success, and the Prince kept rolling the katamari to make everyone's dreams come true." - xbox.com

Abbreviated Walkthrough:
Just play each level, most of them will require two playthroughs and some three. There are different versions of most of the levels and to make the dream come true it will require beating all versions of the levels. As you go through the levels, pick up the cousins. Note that only one cousin can be collected per playthrough of the level, so if there is a level with multiple cousins you will have to play that level multiple times.

Note: You cannot get cousins from Eternal mode.

See this video for a guide of where to find the cousins:
We Love Katamari REROLL+ Royal Reverie - Location Guide: All Cousins

Once all cousins are collected a special level will be unlocked. Complete that level to make another dream come true and get another achievement. 

Play the Elephant and Bird level in Eternal mode to roll up the King first (will need to be over 3000 meters). Press button-x.png and exit and the achievement will unlock. Replay the level again and this time the Queen will be there and roll her up (3000 meters at least) and you will get that achievement.

There are five new levels called the King's Memories. Play these and beat them and you will get an achievement.

For the collection achievements, the hardest one is collecting 2000 items but it should unlock naturally while playing the game. I got it about 2/3 through the game. 

Once all that is completed you should have all the achievements completed. If the final achievement for getting all the achievements completed hasn't unlocked, play the Rose level and press button-x.png to exit and it should unlock!

Multiplayer:
Offered but no achievements are online or co-op

Conclusion: 
This is an easy game to play and beat 100%. Getting all the cousins is the most tedious part but with a YouTube guide it will be no trouble.
 
[XBA would like to thank cagebox for this Roadmap]

We Love Katamari Reroll+ Royal Reverie Achievement Guide

Printable Guide
Show completed achievements
Show secret achievements

There are 35 achievements with a total of 1000 points

  • Make Soccer Kid's dream come true.

    Tutorial level. Just beat this level. Play it a second time with Ace to get another cousin. 
  • Make Rainbow Girl's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Lazybones's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Grandpa's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Grandma's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Bird and Elephant's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Dog's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Ikebana Teacher's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Substitute Teacher's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the F1 Racer's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Rain Coat Girl's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Dr. Katamari 's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Crane Hat Boy's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Just-right Girl's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Cowbear Farmer's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Excited Baby's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Cleanly Mom's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Fund-raiser's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Hansel & Gretel's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Float Boy's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Camper Man's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Mini-Sumo's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Book Worm's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make the Snow Child's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Michiru Hoshino's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Tomio Hoshino's dream come true.

    Just beat this level. Play all versions of the level. Once done achievement will unlock. Another way to ensure you have played all versions of a level is to speak to the person and if the king asks you which version of the level you want to play. If he gives you the option that means you have played and beaten each version of the level.
  • Make Mutsuo Hoshino's dream come true.

    This level will only be playable when all the cousins are collected. The level is easy and beating it will unlock this achievement. 
  • Listen to all the King's memories of old.

    Go to the sword to access these levels. They are a bit different than normal levels but easy enough. Clear all five for this achievement.
  • Roll up every last cousin.

    As you go through the levels, pick up the cousins. Note that only one cousin can be collected per playthrough of the level, so if there is a level with multiple cousins you will have to play that level multiple times.

    Note: You cannot get cousins from Eternal mode.

    See this video for a guide of where to find the cousins:
  • Roll up the King.

    Play the Elephant and Bird level in Eternal mode to roll up the King first (will need to be over 3000 meters). Press button-x.png and exit and the achievement will unlock. 
  • Roll up the Queen.

    Replay the Elephant and Bird level in Eternal mode after already rolling up the King (will need to be over 3000 meters). Press button-x.png and exit and the achievement will unlock. 
  • Roll up 100 types of things.

  • Roll up 1,000 types of things.

  • Roll up 2,000 types of things.

    This should unlock naturally while playing the game. I got it about 2/3 through the game. If you are having trouble you can replay the Elephant and Bird level as there is a bunch to collect.
  • Unlock all achievements.

    If this achievement hasn't unlocked, play the Rose level and press button-x.png to exit and it should unlock!

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