Here is the full list of all 26 Delver achievements.
Take 400 damage in one run.
Max out on backpack slots.
Chow down on 40 things in one run.
Escaped with the Orb.
Zap wands 300 times in one run.
Kill 150 monsters in one run.
Find 5 secret areas in one run.
Use 10 scrolls in one run.
Use 15 potions in one run.
Max out on belt slots.
Trip 10 traps in one run.
Buy a magical elixer from Joff.
Find 300 gold in one run.
Grab the orb.
Make it through the Ruins
Become poisoned 10 times in a run.
Make it through the Sewers
Make it through the Caves
Listened to the wise.
Identify 5 items in a run.
Buy a belt slot.
Buy a backpack slot.
Bought something from Joff.
Bought something from the wizard.
Make it through the Dungeons
Died, for the first time.