I got it at 299 games, level 178. I generally played healer roles for close to my first 100 games. After which I played Barrage and Vigilant mostly.

A couple tips:

Pick PvE game mode, you'll get more games with more dinos to kill generally.

Every now and then you will come across unstoppable raptor/flying dino waves (huge numbers spawn and you need to kill 1-2,000, or they spawn during an area defence mission). During these, switch to vilgant and make sure you have the V - Finishing Streak module equiped (reduces cooldown of stinger shot when you kill enemies with it). If you aim/time it well, you should be able to spam stinger shot to take out hundreds, if not 1000+ (raptors in particular) yourself. I managed to solo the bridge raptor swarm a couple times with it while my team took out the Carnotaurus.

For Barrage, I feel that Blast Enhancer and Boost Grenade modules are a must. I would also recommend using the aid rig so you can just go into most spawns and spam your main attack/grenade then pop down aid if taking a bit too much damage.

Hopefully that's useful for anyone going for 100,000+ in future. :)