ARMY OF TWO BOOSTING 

These are not all the multiplayer achievements, but only the ones that can be easily boosted. You will need three other people to boost as rank matches require four players.

The SCC Challenge achievements require you to download a DLC for 600 MS points and includes four new maps.

Surviving The Game - 25 points

Complete a ranked match without ever needing to be revived.

One Gun is Enough - 35 points

Win a ranked match without purchasing any additional weapons.

True SSC Challenger - 25 points

Win every stage of a ranked three round SSC Challenge match

You have to go through each stage before the other team in a 3 round ranked match. You should pick up "SSC Challenge Win"

Barrel SSC Challenger - 25 points

Destroy 500 barrels in ranked SSC Challenge matches

This is easy with three friends. Load up Warehouse 2 map and near the end of the map there are 20 barrels that continue to re-spawn every 30 seconds.

SSC Challenge Win - 25 points

Win a ranked SSC Challenge match

See True SSC Challenger above. 

SSC Challenge Marksman - 25 points

Achieve 75% accuracy at the conclusion of a ranked three round SSC Challenge match

Just shoot the first target then do nothing else or move. Do this for three rounds. Let your opponents reach each stage and they will unlock "True SSC Challenger". Then switch.

CHECK OUR ACHIEVEMENT GUIDE HERE