し…四角い

Obtained by typing one message with character limit hit = 91 to a friend, using the Warp Trotter chat box skin which is rewarded to you upon completing the Aetherium Wars event storyline.

This achievement has no cultural references in the English and Chinese versions. This phrase could be interpreted as repeatedly sending messages or advertisements about SPAM (the meat product made from pork) in an unsolicited manner, which is a playful twist given the dual meaning of "spam."