Lithium man doesn't unlock if you visit the Animated Forest
If you visit the Animated Forest, you cannot receive the Lithium Man achievement. I've attached a save file that has visited the minimum possible number of places (62), which did not receive the achievement. A character who visits the Dwarven Halls instead is eligible for the achievement. I've attached a save file that visited the exact same locations, apart from DH:1/2 instead of Animated Forest, which received the achievement with 63 places visited.