The walkthrough above is an excellent resource for anyone completing the game, but for some reason the guide solution for this individual achievement did not show up. To get this achievement (which is story related and thus cannot be missed) you just need to complete the game. On the last level at the end you will talk to Locke and walk on the boat and the final cut scene will play and the achievement will pop.
EDIT: Apparently the old walkthrough went down. Another good walkthrough is throough IGN at http://www.ign.com/wikis/lost-via-domus/Walkthrough
. Once again this is only if you get stuck or something, as you only need to complete the game and do not need to collect anything for this particular achievement.