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