Worms Ultimate Mayhem

This is the way I used to get the achievement in 1 match (some of this requirements might not be nessesary, but I got the achievement with those settings).
Objective – Inflict 2000 using your teams secret weapon.

1) Create a weapon:
Go My Worms-> Customise-> Create Weapon
Weapon stats are:
• Air Strike
• Bombs – 10
• Wind Affected – NO
• Detonation – Impact
• Worm Damage – Maximum

All other stats are not that important.

2) Apply weapon to team:
Go My Worms-> Customise->Create/Edit Team
On 3-rd page set your Team Weapon to one you created.

3) Create a match:
Go Local Game-> Versus-> Deathmatch
Insert 4 Player teams (Including the one with your created weapon)
Edit your team to use only 1 worm
Edit other teams to
• Use maximum worms as possible(one team will have 6, other 5 and last will have 4 worms)
• Set handicap to + on those teams
• You can also set the same color for those 3 teams.
At Wormpot enable Double Damage(the icon with green X2 sign on it)
Set Game Style to Beginner (enables your secret weapon)

4) Match:
The idea is to put all enemy worms (from 3 teams) into a short line, that will be covered by your Secret Weapon Air Strike.
When all worms are in this line (mine was 5-6 worm-tall) deploy your secret weapon (the “?” looking icon in your weapon menu) on the worms.

During my try, when first bombs hit the ground my game froze for ~2 minutes and I got the achievement during this freeze (game unfroze and only 1 worm survived, that i forgot to put to the line).