Here is the full list of all 26 Lawnmower game: Mortal Race achievements.
finish track 1
finish track 2
finish track 3
finish track 4
finish track 5
finish track 6
finish track 7
finish track 8
finish track 9
finish track 10
finish track 11
finish track 12
finish track 13
finish track 14
finish track 15
finish track 16
finish track 17
finish track 18
finish track 19
finish track 20
finish track 21
finish track 22
finish track 23
finish track 24
finish track 25
finish track 26