Crunching for Cultists

Travel to the Twilight Ascension basecamp in the Twilight Highlands and click the interactable object at 50.26, 81.42 to start the Tic-Tac-Toe mini-game. You must win 50 times to earn this Feat of Strength.

Always start in a corner — the bottom-right corner is a reliable opening. From there, take 3 corners as your first 3 moves to create a triangle with multiple potential winning lines that the opponent cannot fully block. A second anchor point is at 49.5, 80.12 if you need to reorient yourself in the basecamp.

If the opponent takes a diagonal corner, respond by taking the bottom-left corner, then top-right to create a two-way fork. If the opponent takes a non-diagonal corner, take the diagonal corner — the opponent will take the center, then take any remaining free corner for a two-way fork. If the opponent plays the center after your corner opening, the three-corner strategy may not guarantee a win, but the opponent will often misplay, allowing you to still secure the victory.

Using the Twilight's Blade Top Secret Strategy Training Guide toy counts toward win progress for this achievement, so using it is a valid way to accumulate wins.