Here is the full list of all 44 Imprisoned Light achievements.
Complete single player game.
Clear the Hell.
Kill 4000 monsters.
Activate special power 100 times.
Kill 3000 monsters.
Clear the Shores of Damned.
Kill 100 enemies using special power.
Kill 2000 monsters.
Clear the Limbo
Unlock the Fire Bomb
Save 50 crystals.
Unlock the Fire Shuriken.
Unlock the Frost Shuriken.
Clear the Catacombs.
Unlock the Shuriken.
Unlock the Fire Spear.
Unlock the Frost Spear.
Unlock the Spear!
Unlock the Fire Sickle.
Unlock the Frost Sickle.
Unlock the Sickle.
Unlock the Fire Sledgehammer.
Kill 1000 monsters.
Unlock the Frost Sledgehammer.
Unlock the Sledgehammer.
Unlock the Fire Axe.
Unlock the Frost Axe.
Clear the Sanctuary.
Unlock the Axe.
Kill 500 monsters.
Unlock the Fire Sword.
Unlock the Frost Sword.
Kill the reaper.
Unlock the Sword.
Kill 100 monsters.
Start a co-op play.
Collect 1000000 souls.
Complete co-op game.
Collect 10 peace pot.
Die 100 times.
Die 1000 times.
Get resurrected 100 times.
Kill 5000 monsters.
Kill 10000 monsters.