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