Aside from the ritual, players can earn the achievement by repeatedly using the "Ender-beads" on the Endergirl's stomach (avoiding other interaction points) until she teleports you to a hidden biome.
Here is where the keyword comes alive. The is not a metaphor. To achieve the secret "Poltergeist Engineer" advancement, you must execute the trap activation during an in-game event window: the three real-time days surrounding Halloween (October 30 – November 1). Aside from the ritual, players can earn the
Linus loved three things more than anything else in his drafty, half-finished attic apartment: his table, the quiet quality of a well-oiled piston , and Halloween . Aside from the ritual