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