Here is the full list of all 38 Twin Horizons achievements.
Achieve 100 Combo at least once.
Achieve 300 Combo at least once.
Achieve 500 Combo at least once.
Achieve 750 Combo at least once.
Achieve 1000 Combo at least once.
Achieve 1500 Combo at least once
Clear one stage.
Clear 10 stages.
Clear 100 stages.
Fail a stage.
Fail 5 stages.
Fail 10 stages.
Get a Full Combo (No WAY OFF or MISS)
Get 10 Full Combos
Get 50 Full Combos
Get 100 Full Combos
Get a Perfect Sweep (Perfect+ or Perfect ONLY)
Get 5 Perfect Sweeps
Get 10 Perfect Sweeps
Get 50 Perfect Sweeps
Get a "Perfect+ Sweep"
Miss a FC or PS by one WAY OFF or MISS
Failed a stage using one of Risky Play Options
Failed 10 stages using one of Risky Play Options
Failed 50 stages using one of Risky Play Options
Cleared a stage using one of Risky Play Options
Cleared 10 stages using one of Risky Play Options
Cleared 50 stages using one of Risky Play Options
Caught 10000 pieces
Caught 50000 pieces
Caught 100000 pieces
Get 10000 Perfect+
Get 50000 Perfect+
Unlock Full Lane mode by reaching XP Level 10
Get MISS for EVERY SINGLE PIECE IN CHART... seriously, what are you doing?!?
Failed a stage while performing a Full Combo......... W H A T ??
Played the entire chart using x0.50 high speed.