Legendary Anniversary Achievement in Halo: The Master Chief Collection

This achievement will unlock once all thirteen missions of the Halo 2 Campaign have been successfully completed on either a Solo Legendary playthrough or Cooperative Legendary playthrough. There are multiple methods in tackling the missions of the Campaign, but keep these general tips in mind when playing:

• Utilize the Noob-Combo (Plasma Pistol/Battle Rifle) at all times when facing Elites; an overcharged Plasma Pistol shot will drain their shields, and a three-round burst to the skull will down the creatures easily
• Utilize ground vehicles – Warthogs, Scorpions, and Ghosts – as frequently as possible; their firepower in missions such as Metropolis, Delta Halo, and The Great Journey will help clear out areas quickly and you can even drive past enemy encounters if the mission allows for it
• When facing Hunters, get close enough so that they charge at you, allowing time to side step their attack; when the orange flesh on their back is exposed, shoot it, as this is their only weak spot
• When squaring off against the Flood, keep a Shotgun or Energy Sword on hand; these are by far the best weapons to use against the parasite
• Don’t neglect the basics of using cover; when your shields drop down, hide behind a wall or crouch behind an object before charging back out into battle
• Try exploring the levels and finding alternate routes behind or around the enemies; this can help save time by skipping major firefights on levels such as Outskirts, Delta Halo, and Regret.

Overall, because seasoned Halo players will be familiar with both level design and enemy behavior, completing the entire Campaign on Legendary will be quite easy, though a very demanding task. Once all the missions in Halo 2 have been completed on the Legendary difficulty setting, this achievement will be yours.