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