Here is the full list of all 17 Temporal Temple achievements.
Unlock Dan
Unlock Mary
Die 25 times
You found it!
Unlock Big Tam
Watch the credits. Thanks!
Unlock Jakarta
Jump 69 times in a single run
Unlock Bone Boy
Use the chest three times in a single run
Kill five Big Guys in a single run
Last over 60 seconds in a single run
Purchase an item from the shop
Last at least 30 seconds in a single run
Use the Healing Shrine to recover health
Kill a haunted enemy
Purchase a weapon from the chest