An achievement made up of 2 parts.
1: Get 20 double-kills with the dropshot
2: Get 3 headshots with the dropshop
Double-killsIt's possible in both competitive and vs. AI. I would definitely recommend "vs. AI" and that you fill a lobby with five people you know or with extra controllers. Then the other players can down enemies. When a second enemy comes to rescue the downed enemy, then down him as well. Then you'll have 2 enemies huddled together. Shoot them - get the double kill.
Rinse and repeat
HeadshotsThe absolute best way to get this is to do it when the enemy is in cover. It's much easier to hit a non-moving target :) I found Old Town to be the best map to do this on. In many cases you'll have the upper hand because of the height difference in the map. It made for some good clear shots :)
Maps where the Dropshot can be foundAvalanche (after avalanche), Clocktower, Dam, Dawn, Fallout, Forge Blitz, Foundation, Glory, Harbor, Hotel, Impact Dark, Lift, Lift Apex, Old Town, The Slab
If someone, at some point in time, can't figure out why it won't pop, i've included the specific requirements in my Trackertool at
https://xbltracker.com/