Here is the full list of all 10 Eternal Threads achievements.
Witness every possible event across all the different timelines.
Watch all possible death scenes across all the possible time lines.
Receive a final revelation.
Save all six housemates while also resolving their personal issues.
Listen to voicemails for all six housemates.
Watch all the housemates reveal their secrets.
Save all six housemates.
Read all letters in the house.
Open all four locked doors in the house.
Save one housemate.