Smooth Operator Achievement in Halo: The Master Chief Collection

As of the April 2015 Title Update, the "Save/Quit" method no longer works when attempting to obtain this achievement. Unfortunately, this means that players will need to legitimately finish all 10 Episode (5 Chapters per Episode) on their own in order to earn the achievement.

With this in mind, players should refer to the following general combat tips when playing each Chapter in Spartan Ops.

• Utilize the Noob-Combo (Plasma Pistol/Battle Rifle or DMR) often when facing Covenant Elites and Promethean Knights; an overcharged Plasma Pistol shot will drain their shields, and a quick precision shot to the head will down the enemies
• For loadout purposes, equipping Promethean Vision or Hardlight Shield may prove to be the wisest choice in terms of armor abilities
• 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 Promethean Knights, be quick to kill their Watchers first since these AI act as a Knight’s defense unit
• Try avoiding close-quarters combat with Knights; their arm blades will tear you to pieces in one swipe at times
• 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

It is worth mentioning here that players will have an UNLIMITED AMOUNT of lives during Spartan Ops. As such, do not be hesitant in rushing the enemies when necessary, especially if you desire to quickly activate/reach an objective rather than killing every enemy on the field. Also, the Chapters do not need to be completed in any specific order, so feel free to jump around if you fancy.

Once all 50 Chapters have been completed Solo, on Legendary difficulty level, this achievement will finally unlock.