The Fall of the Variants Title update for Sentinels of the Multiverse has 5 achievements.
Complete Chrono-Ranger: Best of Times's story challenge to unlock the variant.
Complete Dark Conductor Argent Adept's story challenge to unlock the variant.
Complete Extremist Sky-Scraper's story challenge to unlock the variant.
Complete Captain Cosmic: Requital's story challenge to unlock the variant.
Complete The Visionary Unleashed's story challenge to unlock the variant.