Here is the full list of all 26 Overboard! achievements.
Everything ship-shape in 5 hours or less
Everything ship-shape in 4 hours or less
Clean someone out at cards
Get your way the hard way
All of Malcolm's possessions, into the sea
Discuss literature with the highest authority
Everything ship-shape and Bristol fashion
Get off in 3 hours or less
Get off in 5 hours or less
Money, man and murderer in 5 hours or less
Money, man and murderer in 2 hours or less
Earn a small fortune for your efforts
Six down
Five down
Reunite with Malcolm
Four down
Three down
Allow the killer to escape from justice!
Get yourself a nice man
Two down
Steer the ship
Establish relations with an officer
Get the killer sent to prison
Put an old lady to sleep
Talk someone down
Seven down