Master the lean from behind cover mechanic, which will be critical for your survival.
Both Nano Shots and helmets take up equipment slots, so remember to equip them in your loadout on the Retribution before each level.
They will take permanent damage and will need to be replaced.
Helmets are your only protection from headshots.
You can only heal with Nano Shots, there is no health regeneration in this mode.
But if you feel brave enough, soldier on with these tips. It is intensely realistic and not for the faint of heart. How To Unlock Specialist Mode In Campaign: This Specialist Mode is unlocked after beating the game’s story Campaign on any difficulty.