Intravenous achievements

Complete the game on the 'True' difficulty.

Kill 8 (or more) enemies with a single frag grenade.

Bait an enemy with your microphone, then take them out.

Kill 5 (or more) enemies with a single frag grenade.

Bait an enemy by talking nonsense, then take them out.

Complete the game with ammo auto-grab disabled.

Complete a level unarmed.

Have a flashbanged enemy accidentally kill his own friend.

Over-cook a flash grenade.

Pass out from drinking too much.

Over-cook a frag grenade.

Have your frag grenade shrapnel kill you.