Here is the full list of all 16 Robo Legend achievements.
You defeated Bit Flip and escaped the swamp.
You defeated Cryo and secured the Icelands.
You defeated Segfault and secured the Ashlands.
You defeated Cypher and secured the Wastelands.
You defeated Crypto and secured the Subterranean.
You were jailed by sheriff Julius.
You found Cody Quickdraw and made Billytron very happy.
You helped Judy make the best pie in the cosmos.
You have beaten Space Defender on the hardest difficulty.
You have delivered your Space Trucker cargo on the hardest difficulty.
You saved Gear Town and saved the day
You joined Voidbot and conquered Gear Town.
You saved Gear Town but ended up exiled.
You tried to side with evil but messed it up.
You did so well helping Gear Town that they made you mayor. Hurrah!
You captured all of the robo-fish in the biome fishing holes.