Firstly - Player Match. -> 5v5 Mode. -> Scenario.
Now then, for this achievement; there's 3 phases in which this match progresses through, and on the third phase the objective is what gets you the achievement.
In order to get this achievement you NEED to be on the SNOW PIRATE side, NEVEC side do not get the chance to grab this achievement.
Phase 1 - Repair a piece of equipment. (Nevecs objective will be to stop you)
Phase 2 - To capture and control a room. (Nevecs objective will be to capture and hold the position, not allowing you to get it)
Phase 3 - This is where snow pirates get the achievement, your objective will be to grab the T-ENG Canister and deliver it to an aircraft on the outside, which you have to grapple inside of. The one who holds the Canister and delivers it is the one who gets the achievement, no-one else does.