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