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