The Ambassador achievements

Killed 3 enemies with one shot from the Buster Wand

Talked to every NPC in the game

Kill 3 enemies with flaming corpses left behind by Flametongue in a single level

Defeated the High Priestess

Killed an enemy in their invulnerable state

Defeated a Bulger

Defeated Balor

Defeated Fergus

Defeated a Golem

Defeated a Treant

Defeated Caor

Defeated an elite enemy