Here is the full list of all 53 The Legend of Heroes: Kuro no Kiseki Ⅱ -CRIMSON SiN- achievements.
Entered the sauna in the capital in Parts I, II, III + the finale, as well as the hot springs in Messeldam and Langport.
Cleared the game on Nightmare difficulty.
Played in all 4 of the school festival's performances.
Changed BGM via Marduk Support in the Märchen Garten.
Played all 3 activities on Nemeth Island.
Raise the Law/Grey/Chaos level all to 5.
Raised all “Connect Stage” to max level.
Earned all achievements (excluding EX).
Defeated the boss on Floor 9 in the Märchen Garten.
Raised all crafts of any one character to max level in the Märchen Garten.
Completed the final chapter.
Performed pre-emptive Shard Attacks 250+ times
Completed Chapter 7.
Raised the Chaos alignment to max level.
Completed a chapter with an evaluation of S (excluding Prologue)
Raised the Arkride Solutions Office rank to AAA.
Completed Chapter 6.
Raised the Grey alignment to max level.
Raised the Law alignment to max level.
Generated 200+ EX Chains.
Used the SCLM Chain and SCLM Support a combined 500 times.
Performed 500 actions during S Boost
Used S Craft 250+ times.
Collected all Arts Drivers (excluding EX).
Sent 20 gifts
Raised a Hollow Core to max level.
Achieved a tactical bonus of 4.0 or more.
Defeated 300+ enemies on the field.
Defeated 500+ enemies in either Command or Field battle modes.
Defeated 1000+ enemies in either Command or Field battle modes.
Achieved total damage of 100,000 or more.
Completed Chapter 4.
Completed Chapter 5.
Completed Chapter 2.
Completed Chapter 3.
Completed Chapter 1.
Completed the prologue.
Opened the treasure chest in the conductive lock via hacking.
Resumed work as a Spriggan.
Earned all achievements.
Completed all (4SPG) quests.
Filled out the monster book fully (excluding EX).
Filled out the book notes fully.
Filled out the fishing notes fully.
Raised the gourmet rank to max.
Opened 150 treasure boxes (excluding Märchen Garten).
Obtained all Hollow Cores (excluding Alter).
Opened all orbment slots for all 15 characters.
Crafted 1 main weapon part using black steel.
Crafted main weapon parts using black steel for all characters.
Viewed all movies.
Defeated 100+ enemies with Quick Arts.
Used all 7 Dual Arts.