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