A second solution to Dropshots goes as follows:
Yourself, and either a dummy account or one other person
Map: Dual Complex
Dual Complex is actually a better map for suiciding then Pirate Fortress. Its literally a metal cat walk surrounded by death giving waters.
-Basically only one account needs to do anything, so either a dummy account is fine, or your partner literally can just turn on the xbox and walk away
- You must chose to be the fugitive at the start of every match, hit rb its in the menu
- Then simply run off the side of the platform, its takes 4 suicides, but it literally takes under a minute to finish each match; the beauty of dual complex is that no matter where they spawn you, you are basically a jump away from being able to suicide versus pirate fortress which only has the crease at the top
- as long as you hit rematch, the other player never has to do anything, and simply chose to be the fugitive and start the next match
- Just some simple math to give you an idea of time it will require; you need a 100 wins, so the assumption is when you start boosting for this with a 100 online wins; so assuming the high end of the spectrum a minute per match - 400 matches / 60 minutes = 6 hours and 40 minutes total
On the short end of the spectrum - 27 seconds for respawn + 5 secs per suicide = 42 seconds per match; translates roughly to 4 hours and 40 minutes
So it will take somewhere between 5-7 hours to get 400 wins.
Important: DNF is in play in player matches as well, so make sure not to leave any matches early or if you do, make sure to play enough matches to get it back to 0 before attempting ranked matches to finish or start the gunner achievement
Edit 2: using shots setup switch the area to dual complex vs annihilator, match time is between 20-30 seconds , although with in between load time and setup, you will probably be closer to a minute if you are going in rapid succession
Edit 3: Just an update, achievement unlocked today after 3 or 4 games. So I played a total of about 6 hours strictly for this achievement.