Here is the full list of all 49 Death Must Die achievements.
On the hunt for a bat
33 Sync-Ups
A cat dies 9 times
Do not take the purple bait
4 Times jumper
Not a scratch
Get 8 visual effects
I need 40 good men
Instant bash
20 Seconds for two bats
The magic of friendship
Number go up to 30
50 Summoning orders
A stake for a vampire
I wield the 5 elements
I don't need no handouts
5 Lamps to turn off
What we do in the 10th shadow
999 Bandages
300 Steps
Stop the evil old man
4000 Pounds of jelly
A d20 of 400
50 Shields for my wall
25 With a single blow
Defeat the Baron
6000 Bones to pick
Time travelling twice for victory
100000 Wounds Inflicted
A total of 2000 natural 20 damage
A red and a blue bat
500 bones under the sword
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