As with nearly all of these Eternal Achievements - you can set up a deck to target this achievement and play Gauntlet mode. In Gauntlet mode - you can set up a scenario where you prevent the AI from doing anything meaningful by setting up a defensive wall of units that will not be killed if the AI units attack. This creates a stalemate that will let you continue to draw cards and set up the necessary requirements.
This specific achievement relates to using the Dazzle card two times, so you will need at least two copies in your deck. Use Dazzle to stun any enemy unit 2 or higher (at any time) and wait for the AI to cast a spell 2 or higher and use Dazzle to negate that spell (click the card and green arrow the cast spell on the left hand side).
Achievement will unlock at the end of the battle.
NOTE: As of 08 JAN 2021 - there is a bug with Milestones (in game achievements) and Xbox achievements. The Milestones for In Bloom / Ascension / Brilliance are mixed up, so while the in game milestone pops up correctly - you will be awarded the following achievements Brilliance / In Bloom / Ascension.
TLDR: This achievement will pop when the Milestone "In Bloom" pops.