Successfully complete the game to unlock the "Mutant-Clyde" option at the "Cheat" menu.

Complete the following achievements to unlock the indicated number of Xbox Live Gamerscore points:

Absurd Amphibian (10 points)
Become a Frog-Clyde.

Ancestorial Antics (14 points)
Become an Ape-Clyde.

Battle Addict (12 points)
Play Versus mode.

Becoming Baaaad (8 points)
Become a Sheep-Clyde.

D.N.Ain't (16 points)
Become a Mutant-Clyde.

Dupliclone Dash (18 points)
Complete levels 1 to 24 and 10 Challenge levels under the goal time.

Foolish Freedom (20 points)
Exit 75 clones through the ventilation shafts.

Kenn Collection (15 points)
Collect 50 cloned Killer Kenn Action Figures.

Killer Kudos (25 points)
Collect 100 cloned Killer Kenn Action Figures.

King Clyde (20 points)
Complete all of Super-Challenge levels.

Master of all Clyde-Dumb (30 points)
Complete the game.

Poultry Party (12 points)
Become a Chicken-Clyde.