Use the environment against an enemy.

Defeat the Concubine without using grab.

Get to know Elika by talking to her.

Find 20 treasures

Defeat 50 enemies with the Dragon Sniper

Defeat ten enemies in a row with hand-to-hand combat

Reunite with GLaDOS

Finish the game in Easy Mode

Defeat 20 enemies with a single punch, after softening them up with gunfire

Perform 100 Special Moves.

Defeat 50 enemies with the 92FS - 9mm

Defeat three enemies with one explosion

Defeat 30 enemies with the Moss - 12