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