Here is the full list of all 20 Velocity Ventures achievements.
Achieve three stars on Level 1
Achieve three stars on Level 2
Achieve three stars on Level 3
Achieve three stars on Level 4
Achieve three stars on Level 5
Achieve three stars on Level 6
Achieve three stars on Level 7
Achieve three stars on Level 8
Achieve three stars on Level 9
Achieve three stars on Level 10
Achieve three stars on Level 11
Achieve three stars on Level 12
Achieve three stars on Level 13
Achieve three stars on Level 14
Achieve three stars on Level 15
Achieve three stars on Level 16
Achieve three stars on Level 17
Achieve three stars on Level 18
Achieve three stars on Level 19
Achieve three stars on Level 20