Here is the full list of all 38 Toki Tori achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Suck up 30 slugs
Finish all hard levels
Complete all Bubble Barrage hard levels
Find her.
Stand in the beam in Test Lab bonus level 2
Collect all ten snowflakes that appear in December before they melt
Stand in the beam in Test Lab bonus level 6
Find the Tunnel of Love
Complete all Slimy Sewer hard levels
Stand in all sun beams
Complete all Creepy Castle hard levels
Trap 30 ghosts
Complete all Forest Falls hard levels
Finish Forest Falls, Bonus 3
Make Toki Tori dizzy
Collect 1000 eggs
Use 42 InstantRocks™ to finish a level
Use 32 bridges to finish a level
Complete all Test Lab normal levels
Watch the ending
Complete all normal levels without using the Wildcard
Complete all Bubble Barrage normal levels
Press "Try Again" 10 times on one level
Freeze 50 monsters
Complete all Slimy Sewer normal levels
Collect 500 eggs
Trap Toki Tori between two Switchbricks
Finish a level without using all items
Complete all Creepy Castle normal levels
Collect 200 eggs
Play Toki Tori for 60 minutes without being idle for more than 2 minutes
Get really close to a monster
Collect 100 eggs
Fall into the lava
Telewarp directly into lava
Complete all Forest Falls normal levels
Stand on an ice block for 12 seconds
Make Toki Tori look sad