Cheating DeathG 30

Seed: -5878875557040847114
Biome Scale : Medium
Do NOT set the difficulty to peaceful or the Evokers will not spawn.
Turn around and the mansion is right in front of you
You will want to mine for some iron armor and a sword to take on the tough mobs in the mansion
The Evoker is the villager looking mob that casts spells
After you kill the Evoker they will drop a Totem of Undying
Just Equip the Totem and let any mob kill you (The Totem has to be in your hand or it wont activate)
When you get to zero hearts the totem will spin around and you will get the achievement