I think a rating system based on a elo like system (http://research.microsoft.com/en-us/projects/trueskill/) would work better than just "play x games", which might cause players to just join and drop games in orter to increase the number of games payed.
It would be cool if such a rating system of say, 50 levels, with stupid silly titles from "red shirt" to "Galactic Emperor"
lv 0-1: redshirt
lv 2-3: lieutenant
lv 4-5: Fighter Pilot
lv 6-7: Gun commander
lv 8-9 : Senior Brige Officer
lv 10-11: Frig First Officer
lv 12-13: Corvette Captain
lv 14-15: Cobalt Captain
lv 16-17: Krosov Captain
lv 18-19: Carrier commander
lv 20-21: Heavy Cruiser Captain
lv 22-23: Capital First Officer
lv 24-25:Strike force commander
lv 26-27: Donov Captain
lv 28-29: Akkan Captain
lv 30-31: Sova Captain
lv 32-33: Marza Captain
lv 34-35: Kol Captain
lv 36-37: Starbase Commander
lv 38-39: Rear Admiral
lv 40-41: Titan Captain
lv 42-43: Fleet Admiral
lv 44-45: Master tactician
lv 46-47: Theater commander
lv 48+: Galactic Emperor
Some Achievment Ideas:
Schorched Earth: Deal 1000 damage to a planet in 30 seconds
WTF Useless!: Build a planetary shield on a planet with a starbase and aux gov.
Brick: Have a KOL be repaired 90+hp per second with lv3(4,5?) adaptive force field active.
Skip to the end: Use a kostra to jump your fleet straight to the enemy HW, and destroy it.
This must be cheating: Have four+ teammates all research pervasive econ in a single multiplayer game.
One man Army: Your only military unit is a titan (colony ships, scouts, envoys, constructors dont count)
FIRE EVERYTHING!!!: Use 2 missle barrages at the same time in a multiplayer game.
Power level: Deal over 9000 damage in a single update tick to a single target. (easier than it sounds)
Duel Gauss Chain gun: have 2 kols use lv 3 (4,5?) gauss railgun on a single target while under the effect of last stand and flux field.
Interspecias relations: Have a human ally of another race use a capital ability on your ships.
Instant bombardment: Research 3 levels of pinpoint bombardment, and 2 levels of gravity tolerance, and have a vulkuras under the influnce of distort gravity jump to an enemy gravity well.
Run away!: Order your fleet to retreat from an owned gravity well when you outnumber the enemy 2:1 (enemy fleet must be at least 50 fleet supply)
SOLAR empire: build 4 starbases in a single sun, and upgrade them each at least 4 times.
Phase drive offline!: Inturrupt the phase jump charge up sequence of an enemy capital ship 5 times within 2 minutes.
Your doing it wrong: Cast animosity, and then cast vengence on something other than a battleship.
Totally helpless: Use both vertigo and disorientation on the same enemy at the same time.
Nice try: have an enemy try and cast an interupt on a capital ship using a channeling ability and being healed by a domina.
No time to rest: No military unit idle for longer than a single minute for the entire match.
And...: assuming Impulse reactor does have some sort of better rating system:
Decent player: maintain a drop rate of less than 15% in multiplayer matchs. (must play >20 matchs)
Faithful ally: maintain a drop rate of less than 10% in multiplayer matchs. (must play >20 matchs)
Sticking with it till the end: maintain a drop rate of less than 5% in multiplayer matchs. (must play >20 matchs)
Bad connection: Maintain a drop rate of greater than 20% in multiplayer matchs. (must play >20 matchs)
Risky ally: Maintain a drop rate of greater than 35% in multiplayer matchs. (must play >20 matchs)
Quitter: Maintain a drop rate of greater than 50% in multiplayer matchs. (must play >20 matchs)
Questionable tactics: Dont do anything for 20 min durring a team multiplayer match within the last 50 matchs.
No one home: Dont do anything for 40 min durring a team multiplayer match within the last 75 matchs.
Griefer: Dont do anything for 60 min durring a team multiplayer match within the last 100 matchs.