Achievement Source checked
Big Tunnel Achievement: Enter a Big Tunnel
Exact requirement and efficient route for Big Tunnel Achievement: Enter a Big Tunnel on Steam and PS5, with spoiler control and related progression help.
2–12 players Achievement and trophy checklist Updated Aug 15, 2026
Players also call this: enter a major tunnel, Big Tunnel Achievement trophy
The useful answer
Requirement: enter a major tunnel. Complete Yellow Tower and open the matching tunnel route.
Step by step
- Complete Yellow Tower and open the matching tunnel route.
- Wait for the achievement notification before leaving the area.
- If it does not unlock, let the host save, regroup and repeat the final interaction.
Why players get stuck here
Steam has 12 in-game achievements. PS5 uses the same 12 requirements and adds Big Trophy, the platinum awarded after the others. Progression achievements are easiest with the same host because the host owns the world save.
Quick checklist
- Required action: enter a major tunnel
- Use the same host for progression
- Keep the game version matched across the group
- Check the full 100% list before final cleanup
Verify it before moving on
Wait for the platform notification before marking the requirement complete. If it does not appear, keep the same host, reload the saved world and repeat only the final trigger instead of restarting the whole route.
Related Big Walk help
Sources checked
- Printable PS5 trophy list — official names and descriptions
- Big Walk community guide index — completion route cross-check