Blast Helm:
Defeat the Infinity level 50 Boss.

Inferno:
Defeat Colossus (Sector 2 Base Boss).

Judgment:
Defeat Enforcer (Sector 2 City Boss).

Neutron Gun:
Defeat the Infinity level 30 Boss.

Onslaught:
Defeat the Infinity level 10 Boss.

Surge Helm:
Defeat the Infinity level 40 Boss.

Trident:
Defeat the Infinity level 60 Boss.

Vulcan:
Defeat the Infinity level 20 Boss.