Onslaught (Xbox 360)

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Expert difficulty

Finish the game on Hard difficulty.

Ultra difficulty

Finish the game on Expert difficulty.

Upgrade locations

Each weapon (including grenades and the whip) has 2 upgrades that count as additional weapons. The upgrades carry over even if you start a new game on another difficulty (on the same save spot).

WeaponsHow to unlock
2nd level Assault RifleBox in Mission 5
2nd level GrenadesClear Missions 1, 2 and 3 in Normal difficulty (S rank)
2nd level Rocket LauncherClear Missions 9, 10 and 11 in Normal difficulty (S rank)
2nd level ShotgunBox in Mission 11
2nd level SMGBox in Mission 3
2nd level WhipClear Missions 5, 6 and 7 in Normal difficulty (S rank)
3rd level Assault RifleBeat the game in Ultra difficulty
3rd level GrenadesClear Missions from 1 to 8 in Hard difficulty (S rank)
3rd level Rocket LauncherClear Missions from 1 to 12 in Ultra difficulty (S rank)
3rd level ShotgunBeat the game in Expert difficulty
3rd level SMGBeat the game in Hard difficulty
3rd level WhipClear Missions from 1 to 8 in Expert difficulty (S rank)