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