Grandpa – 100% Achievement Guide (Full Walkthrough)

Notes and Tips

All credit goes to Pris!

• Progress will never get resetted, you can die as much as you want and you’ll always keep your items. 
• Dying after picking up an item, will make you respawn with that item, so sometimes dying
  is faster than making your way back to spawn. 
• Grandpa will always spawn at basement. 
• Achievements unlock upon closing the game, they all should come naturally while finishing the game. 

Walkthrough

• 1. Open the cabinet right next to the area where you spawned, green key will be inside. Grab it (E key).

• 2. Take the door to your right, go downstairs, then front door to find an elevator. Drop green key near it (Q key). 

• 3. Now comes the hardest part in the game. Try to sneak around into the other room in this area, and head downstairs to find the basement. 

Note: Be careful here, Grandpa will always spawn in basement (after each death).

• 4. Grab the chainsaw. 

• 5. After that, go all the way up to the 2nd floor, going through the area where you spawned and using the left door this time. You’ll find a police officer body next to a door and a key, drop your chainsaw and grab that key. Use it with the door. 

• 6. Grab chainsaw again, then enter the now open room.
  Use it in the laser area (holding E key) until it explodes. Drop chainsaw as it has no use now. 

• 7. Go to elevator area and open the cabinet here to find red key.

• 8. Return to main room in first floor, open the door with red lock pad. 

• 9. Make your way through this area, until your reach a crossroad.
  Take right path. Left path leads to a death.
  At the very end, you’ll find a piano and a girl hanging, grab the crowbar. 

• 10. Go all the way back to the elevator area.
  Once here, use the crowbar to remove all planks. Drop crowbar and grab the before dropped green key. 

• 11. Take the elevator (doesn’t matter which button you press, you’ll always end in the same place). 
• 12. Use green key with the drawer, drop it and grab yellow key. 

• 13. Return to main area, use key on the door with planks. 

• 14. Lastly, make your way back to the area with the piano/crowbar, but instead of taking the stairs, open the cabinet next to stairs to find an Axe. 

• 15. Now all you have to do is return to main room and use axe to remove planks from the door that had a yellow key pad. 

And that is, congratulations on finishing the game!