Here is the full list of all 63 Earth Overclocked achievements.
Beat the final boss
Defeat the rare Chucab
Finish a run in the Gym Suit
Defeat Treebot
Collect all of the contents in the Mega Slot Chests
Score 50,000 with the Gym Suit
Finish a run in the Magnet Suit
Delay the Apocalypse by 6 minutes in one run
Defeat a Bombcano
Score 50,000 with the Magnet Suit
Defeat a Wumbo Blob
Finish Earth Unleashed in the Ninja Suit
Defeat Elemental Meiun
Defeat a Yeti
Defeat a Crystal Heart
Finish a run in the Ninja Suit
Finish a run in under 15 in-game minutes
Defeat Zombakuto
Defeat the special Gold Blob
Score 50,000 with the Ninja Suit
Defeat a Tree Monster
Finish a run in the Scientist Suit
In the Scientist suit, complete a run without using the revive potion
Buy the most expensive weapon from a merchant
Delay the Apocalypse by 4 minutes in one run
Defeat the rare Slendy
Defeat the rare Jef
Defeat Meteor Bob
Defeat the Blob Bros.
Defeat Meiun
Defeat the Soul of Raynald
Defeat Zombakuto BW
Defeat the rare Mothguy
Defeat a Sandstorm
Defeat the Night Emperor
Delay the Apocalypse by 150 seconds in one run
Score 50,000 with the Scientist Suit
Defeat the rare Benny
Defeat the Royal Dillos
Run into the instant death spikes
Finish Earth Unleashed in the Scientist Suit
Finish Earth Unleashed in the Gym Suit
Finish Earth Unleashed in the Magnet Suit
Beat the Time Empress
Score 200,000 points
Finish a run in the Birthday Suit
Use the Sheep weapon on an enemy
Finish Earth Unleashed in the Birthday Suit
Score 50,000 with the Birthday Suit
Yep. (only need the Singleplayer ones)
Defeat Skeleking
Defeat Foreman Jack
Defeat Mystery
Defeat Frozen Bones
Lose 50 runs
Finish a run in under 12 in-game minutes
Finish a run in under 10 in-game minutes
In the Ninja suit, defeat a boss without using either attack button
In the Magnet suit, have 15 hearts follow you at once
In the Gym suit, defeat a boss with both weapons at full weight
Defeat one of Meiun's Advocates
Take no damage in a run
Take no damage in a run in Earth Unleashed