I have some achievment idea's too,
You fell for the trap - Kill 100 zombies with tripmines, ieds, any class explosive.
Defibrilator Expert - Revive 15 people in one round
Guns N Bombs - Kill a group of 20 zombies with guns and explosives
Rocket Review - Kill 50 zombies with the engineers rocket
Supplier - Give 50000 worth of ammo to teamates
Dodger - Go a whole wave without taking hits from a zombie
Pure Embarassment - Get killed by death zones every round
Last Stand - Finish the round with 5 hp or less
Life giver - Heal a teamate that is at 5 hp or less to 100
Helping hand - heal 1000 hp as a medic
Boom, headshot - Get 50 headshot's as a sniper
A+ Sniper - Get 100 headshot's as a sniper
Supplied - Kill 500 zombies with the supports machine gun
Rambo - Get 20 kills within a minute with the machine gun as a support.
Up close and personal - Kill 100 zombies with shotguns.
Fire away - Kill 150 zombies with rifles
Swift kills - Kill 100 zombies with pistols
Blowing them down - Kill 150 zombies with smg's
Camper - Kill 100 zombies with sniper rifles
Earning the money - Buy 500000$ worth of guns in the market
Survivor - Live for a entire round of zombie hell
Avenger - Kill a zombie 10 seconds after it killed a player
Player - Play 1 hour of zh
A regular - Play 1 day of zh
Faviroted - Play a week of zh
Veteran - Play a month of zh
Obsessed - Play a year of zh
Unlucky - Get backstabbed once every wave in a whole round until the map changes
Anarchy - Get 5 kills with one grenade
There could achievments for all server's, but lets not get ahead of ourselfs here.