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Reach the rank of General of the Army.
Reach 10000 kills in total.
Achieve an "Outstanding" kill combo 100 times.
Reach the rank of General of the Army for a second time.
Blow up 5000 wooden crates.
Blow up 1500 red barrels.
Upgrade any weapon, killstreak or item to the max.
Use 20 Invincibility power ups on yourself.
Use 30 Shields to protect yourself.
Use 50 Medipacks to heal yourself.
Shoot down 20 flying planes.
Destroy 5 of the big track quatro pounder tanks
Buy all of the weapons.
Upgrade any weapon for the first time.
Complete the Boot Camp tutorial mission.