Carry 9 men in your sub

Get a life

Get the first weapon upgrade, the Bow-wow missle

Get the second weapon upgrade, the Adenoid missile

Complete Phase 1

Complete Phase 2

Complete Phase 3

Complete Phase 4

Complete Phase 5

Complete Phase 6

Complete Phase 7

Complete Phase 8

Complete Phase 1 again

Complete Phase 2 again

Complete Phase 3 again

Complete Phase 4 again

Complete Phase 5 again

Complete Phase 6 again

Complete Phase 7 again

Complete Phase 8 again and restart the game

Bring 100 men aboard your little pink sub (across multiple playthroughs)

Upgrade your weapon 10 times

Beat Phase 1 without dying