In mission 1 save the hostage from Shi-Hao and his guards to unlock Military Base MG Arena
In mission 1 kill all Shi-Hao's lieutenants with air taser to unlock Biathlon Mini Game
Complete mission 1: Hotel Fukushima
Complete mission 1: Hotel Fukushima on Hard difficulty
In mission 2 free both female slaves to unlock Rhoemer's Labs 2P Arena
Acquire every weapon available in mission 2
Complete mission 2: Costa Rican Plantation
Complete mission 2: Costa Rican Plantation on Hard difficulty
Complete mission 3 without killing the co-pilot to unlock Missile Silo 2P Arena
Complete mission 3: C-5 Galaxy Transport
Complete mission 3: C-5 Galaxy Transport on Hard difficulty
Acquire every weapon available in mission 4
Complete mission 4: Pugari Gold Mine
Complete mission 4: Pugari Gold Mine on Hard difficulty
Complete mission 5 without killing foreman Jones to unlock Colorado Bridge 2P Arena
Complete mission 5: Pugari Complex
Complete mission 5: Pugari Complex on Hard difficulty
In mission 6 eliminate all seven snipers without being detected by them to unlock Shirpur, Afghanistan 2P Arena
Acquire every weapon available in mission 6
Complete mission 6: Kabul, Afghanistan
Complete mission 6: Kabul, Afghanistan on Hard difficulty
In mission 7 reach captain's quarters without killing civilians to unlock S.S. Lorelei 2P Arena
Acquire every weapon available in mission 7
Complete mission 7: S.S. Lorelei
Complete mission 7: S.S. Lorelei on Hard difficulty
Acquire every weapon available in mission 8
Complete mission 8: Aztec Ruins
Complete mission 8: Aztec Ruins on Hard difficulty
Complete mission 9 in less than twelve minutes to unlock Phagan's Warehouse MG Arena
Acquire every weapon available in mission 9
Complete mission 9: Waterfront
Complete mission 9: Waterfront on Hard difficulty
Complete mission 10: Docks Final Assault
Complete mission 10: Docks Final Assault on Hard difficulty
Complete mission 11: Convoy
Complete mission 11: Convoy on Hard difficulty
Complete mission 12: The Beast
Complete mission 12: The Beast on Hard difficulty
Complete mission 13: Australian Outback
Complete mission 13: Australian Outback on Hard difficulty
In mission 14 stay undetected until you steal truck to return to helicopter to unlock Rhoemer's Fortress MG Arena
Complete mission 14: St. George Australia
Complete mission 14: St. George Australia on Hard difficulty
Complete mission 15: Paradise Ridge
Complete mission 15: Paradise Ridge on Hard difficulty
Acquire every weapon available in mission 16
In mission 16 rescue and talk to Floyd, Uriah and Peter, find satellite data and enter bunker to unlock Izmailovo Park 2P Arena
Complete mission 16: Militia Compound
Complete mission 16: Militia Compound on Hard difficulty
Complete mission 17: Underground Bunker
Complete mission 17: Underground Bunker on Hard difficulty
Complete mission 17 in less than fifteen and half minutes to unlock Mesa Verde Exhibit MG Arena
Acquire every weapon available in mission 18
Complete mission 18: Senate Building
Complete mission 18: Senate Building on Hard difficulty
Complete mission 19: DC Subway
Complete mission 19: DC Subway on Hard difficulty
Complete any Assassin mini game
Complete any Assassin mini game on Commander difficulty
Complete any Biathlon mini game
Complete any Biathlon mini game on Commander difficulty
Complete any Demolition mini game
Complete any Demolition mini game on Commander difficulty
Complete any Elimination mini game
Complete any Elimination mini game on Commander difficulty
Complete any Thief mini game
Complete any Thief mini game on Commander difficulty
Complete any mini game at New York Slums arena
Complete any mini game at New York Slums arena on Commander difficulty
Complete any mini game at Wispering Woods arena
Complete any mini game at Wispering Woods arena on Commander difficulty
Complete any mini game at China Exhibit arena
Complete any mini game at China Exhibit arena on Commander difficulty
Complete any mini game at DC Subway arena
Complete any mini game at DC Subway arena on Commander difficulty
Complete any mini game at Washington Park arena
Complete any mini game at Washington Park arena on Commander difficulty
Complete any mini game at Military Base arena
Complete any mini game at Military Base arena on Commander difficulty
Complete any mini game at Phagan's Warehouse arena
Complete any mini game at Phagan's Warehouse arena on Commander difficulty
Complete any mini game at Colorado Bridge arena
Complete any mini game at Colorado Bridge arena on Commander difficulty
Complete any mini game at Mesa Verde Exhibit arena
Complete any mini game at Mesa Verde Exhibit arena on Commander difficulty
Complete any mini game at Rhoemer's Fortress arena
Complete any mini game at Rhoemer's Fortress arena on Commander difficulty
Complete any mini game on Trainee difficulty
Complete any mini game on Rookie difficulty
Complete any mini game on Agent difficulty
Complete any mini game on Special Agent difficulty
Complete any mini game on Commander difficulty
Complete all mini games at all arenas on Commander difficulty
Acquire every weapon available in mission 1