This Seeking Tech guide will show you how to easily unlock the Super Argentine Backbreaker trophy and achievement in Metal Slug XX.
To unlock this, you need to “throw 30 enemies with Clark’s Special Action.”
Use the following video as a visual guide:
For the first step: make your way to the beginning of Stage 2 as Clark.
When heading down the first elevator, jump to the right and then ignore the soldiers. You should then destroy the right-most crate without hurting the nearby enemy.
Another crate should then drop on the left side of the screen, right next to the soldier with the siren. Break that crate in order to trigger a fight with the 100 Morden Soldiers.
You can then throw the enemies until the trophy in unlocked.