Riverbond
57 Achievements
1000 XP
Epic
Poking Around
Defeat 20 enemies with any Spear
20 XP
34.0%
How to unlock the Poking Around achievement in Riverbond - Definitive Guide
The first spear you get is the Crab Spear which is in the first area (Kill the Crab Nests) of the first level, Restwater Valley. There are a lot of crabs as well as other enemies so you will get the achievement pretty quickly.
I found the spear weapon terrible, so I'd suggest getting this early with the first spear type you find.