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