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Mass Effect 3: can the veteran trophy be acquired through the armax arsenal or multiplayer?
I didn't play any of the MP and only did 1 playthrough of the game. Grinded the remaining kills using the combat simulator. Kills during MP are said to count towards the trophy too though, so you can do either, or both.
I guess Armax would be the better solution, so did I
If you're looking for another option, I cleaned up veteran using the infinite spawning Cannibals near the beginning of the game.