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