The Dead Tree of Ranchiuna (HP)

Watch through the credits and after they are done the achievement should unlock. There's also a secret door you need to unlock after the credits.
Intro 0:00
Walkthrough 1:00
Gate 1 8:20
Gate 2 19:10
Gate 3 47:20
Lockpick Secret Door 1:22:05

Once the "Ponder when I wander" achievement unlocks, walk a bit farther and you will be back in the home village. Walk down to the first house (Mom's!) for another colored ghost cut-scene, then go back up to the dead tree and interact with the gargoyle. A door will open in the side of the cliff which leads to the catacombs. Go in a ways and watch the last colored ghost cut-scene. The Credits will then roll. Watch them all (very short) and this achievement unlocks. BUT DON'T shut down and delete this game quite yet! There is a post-credits achievement.