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