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