Intravenous achievements

Complete a level whilst using naught but the Taser.

You really enjoy listening in on private matters, don't you?

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

Complete the game with ammo auto-grab disabled.

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

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

Complete a level unarmed.

Have a flashbanged enemy accidentally kill his own friend.

Pass out from drinking too much.

Have your frag grenade shrapnel kill you.

Over-cook a flash grenade.

Over-cook a frag grenade.