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