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