Here is the full list of all 49 Death Must Die achievements.
A cat dies 9 times
Do not take the purple bait
20 Seconds for two bats
Not a scratch
33 Sync-Ups
4 Times jumper
I need 40 good men
What we do in the 10th shadow
Get 8 visual effects
Instant bash
A d20 of 400
The magic of friendship
999 Bandages
On the hunt for a bat
A stake for a vampire
Number go up to 30
I don't need no handouts
5 Lamps to turn off
Time travelling twice for victory
50 Summoning orders
Defeat the Baron
300 Steps
I wield the 5 elements
Stop the evil old man
4000 Pounds of jelly
50 Shields for my wall
25 With a single blow
6000 Bones to pick
A red and a blue bat
500 bones under the sword
A total of 2000 natural 20 damage
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