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