You must play Multiplayer and get experience to "Level Up" and after a certain amount of level ups you can unlock new weapons for kits.
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You must play Multiplayer and get experience to "Level Up" and after a certain amount of level ups you can unlock new weapons for kits.
You complete challenges that unlock body kits, then do daily challenges for a long while
The Battlefield stage is accessible in Super Smash Flash after you clear All-Star Mode as any character.
If you mean the orignal battlefield game (Battlefield 1942), then no, you do not, it is a standalone game.
Battlefield 2/python/stats/bf2/unlocks.py