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