Here is the full list of all 14 Supaplex achievements.
"Eat away" activate the terminal.
Complete 20 levels.
Complete 40 levels.
Complete 60 levels.
Complete 80 levels.
Complete 100 levels.
Complete the last level.
Complete all levels.
Complete all 5 training levels.
"Eat away" 50 infotrons.
Go through 100 ports.
Move 100 zonks.
"Eat away" 50 tiles whith bugs.
"Eat away" the bug.