Here is the full list of all 23 Mekazoo achievements.
Collect all Gems
100% completion
Collect all Stay Alive Medals
Collect all Bounty Medals
Collect all Time Medals
Find all secret switchers
Unlock all platings, glows, and costumes in the Mekapod
Beat a Level in co-op
Beat a Boss in co-op
Equip boss costume
Collect 60 gears
Collect 100 Gems
Unlock the pelican
Collect a Gem via 400 mekaballs
Collect 25 gears
Exorcise the armadillo
Unlock the panda
Alter your appearance in the Mekapod
Unlock the wallaby
Collect 10 Gems
Collect your first gear
Unlock the frog
Recharge your shield