Here is the full list of all 22 Flynn: Son of Crimson achievements.
Quickly skip Bohrin's dialogue.
Have an enemy frozen, burned and zapped simultaneously.
Perform a full plummet combo with any Crimson weapon.
Acquire every skill from Loretta.
Completed all levels, acquired every relic and learned every skill.
Have a throwable rock bounce on an enemy 5 consecutive times without touching the ground.
Complete the 6 challenge stages.
Starting with an uppercut, perform a full aerial combo with any Crimson weapon.
Find Bax in 4 separate locations.
Chain zap 7 enemies with lightning magic.
Using the sword, pogo-bounce on 4 separate enemies without touching the ground.
Find, collect and sell all 20 relics to Yombal.
Defeat a training dummy in Sanctia.
Defeat Zealock
Defeat Imbra the Shadow Sorceress.
Defeat Xellios the Toxic Marksman.
Defeat Rozia for the final time in the Desolate Woods.
Defeat Kravios the Aquatic Voltknight.
Defeat Bora the Whirlwind Assassin.
Acquired your first skill.
Find and collect a golden relic.
Set out on an adventure with your beloved friend, Dex.