EXO Dynamics Solar System Mastery

The meta-achievement: everything else in the list. Nothing is missable or time-limited and nothing needs a second playthrough - one save can do the lot. You will need a friend for the multiplayer handful (EXO Dynamics Outreach Participant, EXO Dynamics Outreach Advocate, 675606844, 771888104, Interplanetary Road Trip), and the long pole is Secrets of the Universe's 34-chamber lap of the solar system; everything else falls out of a normal completionist run. Grand tour done, badge earned - EXO thanks you for your continued assistance. :)