Here is the full list of all 49 Death Must Die achievements.
A cat dies 9 times
Get 8 visual effects
Not a scratch
20 Seconds for two bats
33 Sync-Ups
The magic of friendship
A stake for a vampire
A red and a blue bat
I don't need no handouts
Do not take the purple bait
4 Times jumper
A total of 2000 natural 20 damage
What we do in the 10th shadow
5 Lamps to turn off
On the hunt for a bat
Number go up to 30
Defeat the Baron
I wield the 5 elements
999 Bandages
500 bones under the sword
A d20 of 400
50 Summoning orders
Instant bash
300 Steps
Stop the evil old man
50 Shields for my wall
4000 Pounds of jelly
25 With a single blow
I need 40 good men
6000 Bones to pick
Time travelling twice for victory
100000 Wounds Inflicted
Win an attempt as Avoron using the Light Rays blessing from Lady Justice
Travel to 40 different locations in an attempt as Avoron.
Win an attempt as Merris using the Telekinesis talent
Win an attempt as Merris using the Charged Field talent
Win an attempt as Nixi using the Endless Night talent
Win an attempt as Nixi using the Mind Reaper talent
Win an attempt as Front using the Rampage talent
Defeat The Djinn as Front
Win an attempt as Skadi and her wolves
Win an attempt as Skadi with Darkness
Level up to 40 as Lorien
Kill 1000 Skeletons as Lorien
Lose an attempt as Lorien
Defeat The Insect Queen as Lorien
Traverse 50000 distance as Lorien
Win an attempt as Lorien using the Bask in Greatness talent
Win an attempt as Lorien using the Whistling Arrow talent