Here is the full list of all 20 Silent Rain achievements.
Launch a game for the first time
Eradicate the contamination
Find the Secret End
Get one Occult Card
Get 5 Occult Cards
Get 10 Occult Cards
Get 20 Occult Cards
Get 30 Occult Cards
Save someone from death
Find the secret room
Revive a ghost
Finishing a game with a group of 4 players
Feed a sentinel
Vomit a sentinel
Win a solo game
Try to leave the street
Find a diary
Find the spirit
Transform into a sentinel
Scream at another player as a sentinel