Here is the full list of all 20 Scikor - there are Final Scale achievements.
Run fast through planet Gosno level
Achive Gold time on planet Zalwa
Gold on Liranzi
Complete Nyezi on the fast way
Gold time on planet Siwi
Achive a fast time on planet Dayin
Run fast on planet Isgo
Collect the Gold Plate on planet Liranzi
Collect the Silver plate on planet Gosno
Collect the Gold Plate on planet Dayim
Collect the Silver Plate on planet Gosno
Collect the Gold Plate on planet Isgo
Collect the Silver Plate on planet Liranzi
Collect the Gold Plate on planet Nyezi
Collect the Isilwa Gold Plate on planet Nyezi
Collect the Gold Plate on planet Siwi
Outside the Mothership
Hided in the Mothership
Surpass the last challenge
Complete the Bonus Level, the Golden Butterfly is on Level 1, Zalwa