Ok, so I'm working on rebuilding my Shepards (x5) in preparation for Mass Effect 3 next March, and I'm considering working on 'The Arrival' DLC. I've finished it once before, but didn't get the "Last Stand" Achievement... I'm just curious as to what were other people's tactics for that part of the DLC and what gear/class you were. When I finished it for the first time, my Shepard was a Soldier with all the following weapons: Mattock, Geth Plasma Shotgun, Widow Sniper Rifle and Phalanx pistol. Armor wise, the full Kestrel set, except for the headpiece, that was the Recon Hood... oh, and my heavy weapon of choice was the Collector Particle Beam weapon.
Now, on my current playthrough, I'm a Engineer with the Geth Plasma Rifle (Got the **** Rifle Training on the Collector Ship), with the Locust SMG and Phalanx... I'm just wondering if there's a particular choice in Heavy Weapon I should take (I have at the moment the M-100 Grenade Launcher, M-622 Avalanche, Collector Particle Beam, ML-77 Missile Lancher, M-451 Firestorm, M-490 Blackstorm Singularity Projector and the Arc Projector). I've heard that the Arc Projector is a pretty good choice, for using when trying to get that achievement, but are there any others which would be better?