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