Here is the full list of all 22 Soulslinger: Envoy of Death achievements.
Own 100 gold
Blow up an enemy with Explosive Bullets
Complete the game on insane difficulty
Choose to summon elite enemies and defeat them
Try to enter the Gate of Beyond for the 18th time
Spread poison to 20 enemies in a single fight
Perform 6 successful fast reloads in a row
Reach 150 maximum health
Clear the Land of Memories without selecting any active abilities
Fall off a cliff 30 times
Dash 1000 times.
Get crushed by a rock thrown at you
Find a hidden Schematic
Find all weapons and relics in the Land of Memories
Own 1000 gold
Buy your first item from Dead Eye
Buy all four items from Dead Eye
Hit enemies with your melee attack 1000 times
Set 1000 enemies on fire
Stun enemies 1000 times
Upgrade or reforge one of your active abilities
Break open 1000 crates