Swamp Crystal (Swamp Cave)
Enchanted Crystal (Enchanted Forest Cave)
Haunted Crystal (Haunted Forest Cave)
Crystal Eyeball (Eyeball Cave)
Wretched Crystal (Wretched Cave)
Sabretooth Crystal (Sabretooth Cave)

This achievement requires you to enter 6 caves, retrieve the crystals, and give them to the spelunker. The spelunker will be outside each cave, so all you need to do is find the cave and you'll find the spelunker. The area map shows these caves. Locations :

1. From the eyeball trail outhouse, take the path south until it splits, then go off the path and go southwest and you should see the cave at the dead end.

2. Southeast of Rich Cabin's outhouse, right next to the swamp outhouse.

3. Teleport to the haunted lake outhouse. Take the path south, then when it starts to go east and then north, go off the path instead and go straight east.

4. Take the wretched outhouse, then go northeast. You'll pass by a little entrance to the spitting chizard pit. Keep going northeast and you'll run into it.

5. Again, from the wretched outhouse, go straight north and into the little path between the hills, into the field of donkeys, and then go northeast to find the cave.

6. From the talking tree outhouse, go southwest. It'll be straight west of the Leprecolony on the area map.