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