Here is the full list of all 27 The Gallery - there are Episode 2: Heart of the Emberstone achievements.
Collect, view, and read all the lore in the game.
View all the Polaroids in the game.
Complete the game within a 93 minute runtime.
Finish the game without harming any Wizgogs.
Clear the crypt without using the flashlight.
Solve every Gauntlet puzzle.
Complete Episode 2.
Have a nap in the Transport Room tent.
Activate the Easter Egg.
Kill the captured Wizgog.
Repair the Solar Engine.
Play the Cosmic Key.
Give Hermie a new home.
Build a large tower in the Culling Grounds.
Pop a Wizgog without using the Arbalest.
Blast 10 corpses with a single Arbalest shot.
Build a small tower in the Culling Grounds.
Reunite the spectators of the Cull.
Kill every Wizgog in the Culling Grounds.
Read all the stories of the people of Ember.
Complete every cog puzzle and unlock Sebastian's safe.
Dismember 44 limbs.
Obtain the Grasp.
Collect all the tapes in the game.
Send a corpse down the shaft in the Tower of Cogs.
Kill the Mother Wizgog.
Meet the Beast.