I want see a long time motivating lvl up system. That means - you need to play rather a long time to hit the maxlvl, referring to BF2.
Achievements that need long time to finish. Sure there will be some feeding achievements, but the main ones should prove your dedication to the game. In other games, every noob has pretty much the same as a pro player. Whether you do long time achievements, idk like 10k, 100k kills, 1k, 10k plants
The main ones can be really ridicously huge. Still basic ones for everyone, but only in the phase, as long as the average playing time of a average player.
IMHO it can take pretty a long time. Lets say at least 400 hours to reach maxlvl.
When ppl get maxlvl and already has pretty much everything, the motivation of achievements wont have any effect anymore. Most players probably move to the next game then (my experience with bf3 players). Ranks that have meaningful names, which justifies the amount of played time. This is a must in my eyes.
Even when ppl already hit the maxlvl after that XXX hours, you can offer for that “hardcore veteran” a new lvl package for the lvl^^ There could be 10 lvl packages overall, everyone with 150/50 depends on how often you want to let ppl lvl up. I think there is also potential to get some money out of it^^ You know see some player with LVL 6/10 45 (fancy badge)^^
It could also be stay subtle, that you fool ppl in the beginning, make them believe that there is a rather low max lvl… but when hitting it ppl will see that is just the peak of the iceberg^^ You can have many micro steps, or a few big ones. I dont care, as long as it takes long.
Lets say 2500 hours then for the whole ultimate maxlvl of maxlvls
Wow this would be freaking awesome^^ Im sure there will be enough ppl who want to accomplish this xD The fascination of seeking for the maximum^^ I think many ppl get addicted to it^^ The longer it takes to hit max lvl the better imo.
Actually i would prefer kind of stats/skill based lvl system, which can you drag back and forth, some rating shown in your profile beside your current lvl.
Any other lvl system/achievement suggestion, thought, criticism?

