There are a large number of special achievements in "Stride Together," and many of them are quite troublesome to complete. "Big Stride" is one of them. The requirement for this achievement is to cross the suspension bridge, which isn't too difficult. Find 4 light orbs (blorbs) in the starting area and bring them to the key unlocker. After unlocking the key, take it to the 5 key crafting slots.
How to Complete the Big Stride Achievement in Stride Together
Big Stride
Cross the suspension bridge
Find 4 light orbs (blorbs) in the starting area and bring them to the key unlocker. After unlocking the key, take it to the 5 key crafting slots.
When you insert the key into a slot, an arrow will appear on top of the key, indicating the direction of the next slot!
Take the crafted key to the red bridge/suspension bridge and insert it into the slot to lower the bridge. The achievement will unlock when you step onto the suspension bridge.