Here is the full list of all 25 Angels That Kill achievements.
You completed the Nightmares game mode.
You completed the Valentines Day Massacre game mode.
You completed the game and obtained the first ending.
The confrontation.
A path to darkness.
Old friends reunited.
A troubled start.
Baley phoning in.
You completed the tutorial.
You completed the game and obtained the second ending.
You completed the game and obtained the third ending.
You completed the game and obtained the fourth ending.
You completed the game and obtained the fifth ending.
You completed the game and obtained the sixth ending.
You completed the game and obtained the seventh ending.
You completed the game and obtained the eighth ending.
You just did it.
That is all folks.
Wait a minute...or five.
You made it this far and have done as much as there is to do in the main story, you entrusted us with your money for entertainment and we hope we managed to deliver that to you. Thank all of you for this amazing support, because even the worst of comments help make us build something better for you guys, it has truly been an honor.
You completed the Two Dark Nights game mode.
You completed the platformer!
Bickel phoning in.
You found a mysterious key in the main game, I wonder what it is for?