相親相愛一家人

You can borrow a relevant unit from a friend for this achievement. You can run Difficulty 1 in Echo of War without spending stamina (after your 3 weekly runs).

"One Big Happy Family" is an expression that typically refers to a group of people who share a close and harmonious relationship, treating each other with love, respect, and support. You, the Trailblazer, are not a part of this happy family.