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