Full list of all 20 The Matriarch achievements.
The base game contains 8 achievements, and there are 7 DLC packs containing 12 achievements.
Escape while being the last Sinner alive.
Own the Pyre
All BOTs survived
Kill 3 Sinners during the triple sacrifice
Own the Guillotine
All sinners are alive.
The exit code is 666
Escape on the first or second day
Own the Iron Maiden
Jump scare
Spook the Matriarch three times
Unlock a ghost skin
Unlock 5 ghost skins
Win as the traitor
All BOTs survived with 2 Matriarchs
Win as the traitor against 2 Matriarchs
Own the pit
Unlock 1 Matriarch skin