Here is the full list of all 6 The Secret of Gillwood achievements.
You found the first Orb!
You found out the Secret that lays over Gillwood
The light in the lighthouse, sent by the gods, helped the villagers to find their way back home after a days work at seas
The factory's secret storage room, hidden away from the rest of town.
The city market is one of the most important parts that keeps Gillwoods inhabitants alive!
The fishing boat lays at the bridge, without this food source the town would not survive! The vegetables is not enough for Gillwood to survive.