Broforce

Brommando is the character looking like arnold schwarzenegger with green war paint and red missiles as his special. At the end of a mission clear all enemies besides satan off the roof and then hold cn_Y or your melee button near satan to grab and throw him. Depending on how wide the roof is you need multiple throws. After the first throw he will start to run and you need to time your second melee so you are close enough to not kill him with a knife. You also must throw all other enemy corpses off the roof or you might accidently use melee on them and kill satan with the corpse. Satan can also be thrown down one story if the roof has a hole which will kill him and void the achievement so make sure you dont blow up the roof too much.

To make this achievement even quicker on PC without the hassle of reloading until you get the correct Bro, this works:

*Go to the game editor.
*Let map level and such be, give the map a name and a creator's name.
*Go to Terrain, choose Air and remove enough tiles from the floor below the point where you start so you make a pit Satan can fall in.
*Choose DoodAds, find PureEvil which spawns Satan.
*Choose Meta and scroll down until you can check a box "Force Specific Bros". It is under "Ammo crates will spawn"
*Check the box for the Brommando.
*Press F3 to test the level.
*Press F3 again to spawn Brommando and press F3 again.
*Approach Satan, hold and Brommando will do a shoulder throw, dropping Satan into the pit.

*Cheevo pops.
(Also works on all the other Bros and their specific achievements!)