Here is the full list of all 7 Second Coming: Tactical Training achievements.
You made it through your 1st battle and lived to tell the tale.
So you lost a round...Brush it off and get back in there!
This signifies that you have killed more than 250 enemy combatants!
Yeah yeah, you died...Don't be a wimp about it!
You have died 250 times for your team.
Capture 25 flags in one game.