Worms W.M.D
29 Achievements
GOG
Mount Killmore
Get 40 kills using a mounted gun..
1.1%
How to unlock the Mount Killmore achievement in Worms W.M.D - Definitive Guide
You can farm this by following the same instructions as described in Tanks A Lot Buddy, only setting Mounted Guns to lots instead of vehicles and teleporting the worms close to the gun you plan on using to get the kills with.