No missable achievements (plus 31 unknown)
Sign in with Steam or Xbox to track your progress, and:
Booted up the Oil Blue Achievement App
Completed the tutorial
Achieved Rank 48
Achieved Rank 45
Achieved Rank 42
Reclaimed your first island
Achieved Rank 40
Achieved Rank 36
Reclaimed a second island
Achieved Rank 32
Achieved Rank 28
Reclaimed a third island
Achieved Rank 25
Achieved Rank 22
Reclaimed a fourth island
Achieved Rank 18
Achieved Rank 15
Reclaimed a fifth island
Achieved Rank 12
Achieved Rank 10
Achieved Rank 9
Achieved Rank 8
Reclaimed a sixth island
Achieved Rank 7
Achieved Rank 5
Reclaimed a seventh island
Reclaimed an eighth island
Reclaimed a ninth island
Reclaimed a tenth island
Reclaimed an eleventh island
Reclaimed a twelfth island