Here is the full list of all 35 Operation Zeta achievements.
Survive Operation Zeta as a Human
Survive Operation Zeta as an Oohkin
Survive Operation Zeta as a Slugula
Unlock Oohkin as a playable race
Unlock Slugula as a playable race
Survive Operation Zeta as Florbo
Unlock Florbo as a playable Character
Get killed by the death laser
Survive Operation Zeta a Roki
Unlock Roki as a playable character
Beat the game with all races and characters
Have 200 Credits.
Fully upgrade Laser Delay
Beat the game as Frumptar
Unlock Frumptar as a playable Race
Unlock Golemite as a playable Race
Beat the game as golemite
Collect all database entries
Beat sandbox mode
Unlock sandbox mode
Beat the game as a droid
Unlock Droid as a playable character
Survive Operation Zeta as Danny
Survive Operation Zeta as Larry
Unlock Larry as a playable Character
Unlock Danny as a playable Character
Survive Operation Zeta as Gibby
Unlock Gibby as a playable character
Buy all of the Upgrades
Meet all of the Flaxon Five
Unlock the Meows
Complete Operation Zeta as a member of the Meow
Bring Hatrick his special hat
Meet all of the Space Cats
Complete 100 Puzzles