Big Walk
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Cross the drawbridge. Complete the tutorial area's four puzzles, grab and grind the key, and cross the red drawbridge to enter the main island.
Platform:Steam
To unlock the 'Big Walk' achievement you need to cross the drawbridge. In the starting tutorial area, complete its four puzzles, collect the pieces, grab and grind the key, then use it to cross the red drawbridge and enter the main island. This is effectively the first major milestone of the game and the moment the world opens up.