Fast route
Do this in order
- Step 1
Raise Ridge’s relationship and continue his personal story until the treehouse request appears.
- Step 2
Gather every requested construction material before visiting the build location.
- Step 3
Complete the treehouse interaction, then speak to Ridge after the finished scene.
Prepare before you start
Do not begin until the related system or story area is unlocked. Keep the achievement condition visible while you play, and save before seasonal or one-night attempts.