I've had this idea on my mind for a while - avatars for certain achievements, given out to each player that achieves them. There is a similar thing in Warface - you kill 10 000 people from M40A5 you get the "White Feather" stripe and you can either wear that stripe or another one that you got from an earlier achievement. The idea is to recognize people's achievements and, perhaps, encourage them to play more/better to get those shiny avatars. So far I've thought of these:
Field Commander - in 20+ games the player's ACU got 2nd veterancy or higher
Economy master - in 20+ games the player's mass collected was >300k and his energy collected was >1m (maybe 750k)
Master of static defense - in 20+ games the player's building count was >100
Guerrilla fighter - play Cybran for the whole month
Lighting Warrior - end 20+ games within 15 minutes
Total Destroyer - total kill count is >250 in 30+ games
Steamrolling Expert - build >150 units as UEF or Seraphim in 20+ games
Air Traffic Controller - build >100 air units in 25+ games
The Phantom Menace - play 10+ phantom games
Rogue Nomad - play 10+ games with Nomads for Nomads
Rambo - get 5th veterancy on your ACU in at least 7 games
Naval Commander - spam >35 naval units in at least 10 games
Master of Trolling - kill an enemy from ACU's tacpack or with a Billy
Nuke Lord - use over 10 nukes in a single game. Can be any nuke - tactical, submarine, battleship, static, experimental
Hitman - kill the whole enemy team on your own (that is, one player has as many kills as there are players on the enemy team) once
Experimental Killer - kill 15 experimental units in a single game.
Later on, multiple levels can be added, each time complicating the task.
All these things can count only in the games the player has won.
Feel free to suggest changes to the achievements or conditions.