Here is the full list of all 28 Army of Tentacles: (Not) A Cthulhu Dating Sim: Black GOAT of the Woods Edition achievements.
Complete Act One.
Complete Act Two.
Complete the game.
We told you this was a dating sim.
Finish Winter Quarter.
Finish Fall Quarter.
Romance Cthulhu.
Romance Riley.
Romance Thatcher.
Romance Hollywood.
Romance V. Raptor.
Romance Keziah Mason.
Romance Hamlet.
Romance Hamlet's Ghost.
Romance Baldur.
Romance no one.
Across all playthroughs, romance everyone.
Cast Riley as Hamlet.
Cast Hamlet as Hamlet.
Cast Cthulhu as Hamlet.
Do the Halloween quest before even getting it.
Equip the Vampire Kangaroo Launcher.
Start a cult.
Got all party members.
That's not how the classic story of Hamlet goes at all. What game do you think this is? Elsinore? Buy Elsinore when it comes out, it's a great game.
Stop it.
Do everything at the Spirit Pines location.
Recruit the first secret party member with the second secret party member.