Microgame Masochist
Dude! You just completed the Microgame Masochist achievement in Grid16 and won the Microgame Masochist badge and 30 points! suvive on all you are good at for as long as possible... keep the one where the 3 balls bounce around and your the yellow ball.. i got to 5.4 with that one from like.... 4.4
Trained Difference Spotter
Dude! You just completed the Trained Difference Spotter achievement in 6 Differences and won the Trained Difference Spotter badge and 15 points!
Medium.... like badge says... :D harder then 5 Diffrences... THANK GOD FOR HINTS!!!
Heres a tip.... i didnt find this out till i wasted around 14k XP.... after a battle wait for the Riseing XP and Money to stop... then hit Continue... It helps alot believe me.....
Sniper
Dude! You just completed the Sniper achievement in The Last Stand and won the Sniper badge and 30 points!
I unlocked the Barrett also! all i did was do reloading glitches with Hunting Rifle / Chainsaw to get 99 shots and Headshot everyone! it was amazing :D (Glitch is take out chainsw at begining and chainsaw nothing and switch weapos. It will reload and then switch to your rifle again to have 100 shots! [it worked for my shotgun, 1st SMG, Hunting Rifle, and Barrett!]) Do that to get the Headshot badge.... Defend your base and dont let it get damaged.... spend all 12 hours on your Weapon Finding (Almost whole game) to get Barret! Barrett PWNS!!!!!
Here are some glitches to help with your troubles....
1) When using Uzi you can reload when you are shooting....
2) Use Uzi and Hunting Rifle Combo and do this.... Start shooting - switch weapons - ammo will go to 0 - switch weapons again and it will be a full ammo Uzi - switch again for a Hunting Rifle with 50 ammo :D
Havent tried other combos so don't know if it works.... Hope I helped a little bit
me and GandalcGul have the same problem... 1st try: 87.6............... 2nd: 89.1.............3rd: 82.7............ 4th:103.4..........got my badge on the 4th one.... lol somethings going on here