Cooperative Medic Unlockables:

When you reach a set level, a new weapon, gear, or berserk becomes available. The weapons and berserks are unlocked upon reaching that level but the gear requires enough gray tech to purchase once you hit that level.

Unlockable	How to Unlock
Level 1	Phoenix (Weapon)
Level 1	Ring of Life (Berserk)
Level 10	Rossmore 238 (Weapon)
Level 12	Phoenix Ash (Berserk)
Level 14	Bioplasm Tracking Tech
Level 16	Assault Pack
Level 18	HE .44 Magnum (Weapon)
Level 2	M5A2 Carbine (Weapon)
Level 22	Bio-amp Scope
Level 24	Voltaic Body Armor
Level 26	Leech Barrel
Level 28	V7 Splicer (Weapon)
Level 30	Psychokinetic Helmet
Level 4	Chloroform (Berserk)
Level 6	Kinetic Gloves
Level 8	High Density Bioplasm Chamber