Here is the full list of all 40 Attack on Titan 2 - there are A.O.T.2 achievements.
Leveled the protagonist to max level.
Unlocked all characters.
Completed all Story Mode Dire Eliminations.
Leveled one character to max friendship.
Completed Story Mode Chapter 1.
Saved 100 or more comrades.
Sent 50 gifts.
Completed your first Dire Elimination.
Completed the final chapter in Story Mode.
Completed Story Mode Chapter 5.
Completed Story Mode Chapter 4.
Reached 50% Gallery completion.
Got 2,000 total body part destructions.
Completed Story Mode Chapter 3.
Maxed out Titan Research Room level.
Eliminated a total of 1,000 enemies.
Completed 100 Side Missions.
Completed Story Mode Chapter 2.
Had over 100 allies die.
Had over 100 allies join.
Completed 25% or more of the Scout Missions.
Built 100 bases in battle.
Used more than 100,000 RegimC40ent Funds in total.
Reached 25% Gallery completion.
Eliminated a Titan with the Hook Drive.
Successfully completed a Sneak Attack.
Got selected as the top performer during training in Episode 1 of the Story Mode prologue.
Increased friendship rank.
Used a Buddy Action.
Achieved a Battle Rating of S in any episode.
Acquired all trophies.
Completed 50% or more of the Scout Missions.
Completed all Scout Missions.
Achieved a Battle Rating of S in all Story Mode episodes.
Reached 100% Gallery completion.
Leveled one character to max rank.
Avoided 100 Titan attacks.
Leveled all characters to max friendship.
Used 1,000 Wings of Freedom.
Maxed out all training.