Check all hints in the pause menu.
Make 10 enemies fall from a ledge.
Kill 20 enemies with a headshot.
Dodge a bullet 20 times.
Strike a kneeling enemy with a heavy attack.
Make an enemy die of fire.
Make an enemy die of electricity.
Make an enemy die of acid.
Parry five enemy counters.
Uncover all rooms.
Collect all health upgrades.
Collect all magazine upgrades.
Collect all logs.
Collect every log and upgrade.
Finish the game on the hard difficulty level.
Complete all achievements.