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