Here is the full list of all 29 Go Mecha Ball achievements worth 1,000 gamerscore.
Enter the portal for the first time
Defeat Glitch Weaver
Defeat King Lurk
Defeat Waveform
Defeat Iterator
Complete a run on the first unlocked difficulty
Complete a run on the second unlocked difficulty
Complete a run on the third unlocked difficulty
Complete a run on the fourth unlocked difficulty
Knock 50 enemies into the abyss
Complete a run in under 30 minutes
Unlock all abilities
Unlock all upgrades
Unlock all weapons
Complete the tutorial
Beat the game with Cat Rascal
Beat the game with Sprout
Beat the game with Prot0N
Beat the game with Mika
Kill 10 Roller enemies with collision damage
Hit three enemies with a Ground Slam
Hit three enemies with a Smash
Reach the true ending
Ensnare 4 enemies with a single NetLink
Have more than 1000 coins
Spend more than 100 coins with a single Midas Wrath
Hit 4 enemies with a single EMP
Killed by a tiny spider
Use a gacha machine for the first time