ONLINE CO-OP (10)
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Description: Complete an online co-op game

Note: You DO NOT need to complete the game from start to finish to get
this!

Start an online game on "Hardcore" difficulty (one life, three energy
slots), preferably with a friend. Once in, get your friend to watch in
one corner while you run straight into the blades of the enemies. The
aim here is to get yourself killed, quickly.

Once you're killed, the achievement will unlock. You've successfully
"completed" an online co-op session according to the programmers of
this game.

and if you need the achievement i will help you out also

topic

No but im looking forward to Saints Row 2 (also coming out Oct 14)