Here is the full list of all 24 Swiftly achievements.
Complete level 24.
Complete level 23.
Complete level 22.
Complete level 21.
Complete level 20.
Complete level 19.
Complete level 18.
Complete level 17.
Complete level 16.
Complete level 15.
Complete level 14.
Complete level 13.
Complete level 12.
Complete level 11.
Complete level 10.
Complete level 9.
Complete level 8.
Complete level 7.
Complete level 6.
Complete level 5.
Complete level 4.
Complete level 3.
Complete level 2.
Complete level 1.