In the present, take Bernard to the second floor and go in the right room to Weird Ed Edison.
If you managed to anger him by
return the collection to him.
Take his hamster from the box in the foreground and try to flush it to Hoagie or Laverne to pop the achievement.
If the hamster is already in the future with Laverne, try to flush it to Hoagie or Bernard before you use him to get