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