Colossal Cave
24 Achievements
GOG
Drums in the Deep
You have an encounter with a dwarf.
23.2%
How to unlock the Drums in the Deep achievement in Colossal Cave - Definitive Guide
At some points in the game, dwarves will appear and sometimes attack you. You can fend them off using an axe, which is dropped by the first one that attacks you. Just get attacked once and the achievement should pop.