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