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