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