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