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