Here is the full list of all 25 The Penguin Factory (Windows) achievements worth 1,000 gamerscore.
Send 500 penguins through splitters.
Change the direction of splitters 100 times.
Use a mallet to hit one penguin into another penguin.
Hit a genuine penguin with a mallet.
Complete level 19 with at least one direction change to spare.
Deliver an imposter penguin by mistake.
Cause a penguin pile up!
Complete a level with less than five seconds remaining.
Complete the game.
Deliver 1,000 penguins.
Send 1,000 penguins through tubes.
Send 1,000 penguins onto turntables.
Hit 100 imposter penguins with mallets.
Turn 1,000 conveyor belts on or off.
Change the direction of conveyor belts 500 times.
Turn 100 mallets on or off.
Turn 250 tubes on or off.
Turn 100 turntables on or off.
Change the direction of 250 turntables.
Collapse 500 platforms.
Complete level 57 with at least two direction changes to spare.
Complete level 60 within 30 seconds.
Complete level 77 having switched the splitter before starting the conveyor belts.
Complete level 40 with a single swing of the mallet.
Complete level 82 having turned off only five turntables.