Here is the full list of all 14 Lust Bunker [18+] achievements.
Pick a branch with Olivia and Emily.
Pick a branch with Lucy and Ruby
Lucy's first adalts.
Give Ruby the tape to digitize.
Search Ethan and Lucy's room.
Check the panel in the restricted area
Go outside in the branch with Lucy and Ruby.
Finish the game in the branch with Lucy and Ruby.
Miss Lucy and Ruby
Get first adalt with Olivia.
Get first adalts with Emily.
See Ethan's journals.
Go outside in the branch with Olivia and Emily.
Finish the branch with Olivia and Emily.