Here is the full list of all 16 Jet Buster achievements.
Beat EX Boss Rush (Continues Allowed)
Beat Boss Rush (Continues Allowed)
Complete Stage 6 (Continues Allowed)
Complete Stage 5 (Continues Allowed)
Complete Stage 4 (Continues Allowed)
Complete Stage 3 (Continues Allowed)
Complete Stage 2 (Continues Allowed)
Complete Stage 1 (Continues Allowed)
Defeat the villain (Continues Allowed)
Beat Expert with No Continues
Complete Stage 6 on Expert (Continues Allowed)
Complete Stage 5 on Expert (Continues Allowed)
Complete Stage 4 on Expert (Continues Allowed)
Complete Stage 3 on Expert (Continues Allowed)
Complete Stage 2 on Expert (Continues Allowed)
Complete Stage 1 on Expert (Continues Allowed)