Here is the full list of all 20 BREAK ARTS II achievements.
Create a weapon with single-shot damage of over 10000
Spend a total of 10 hours in Machine Design
Play Time Attack once
Make it to Rank 4
Reach a top speed of 500 during a race
Spend a total of 1 hour in Machine Design
Break for the first time
Start Break Arts for the first time
Play Online Multiplayer once
Make it to Rank 7
Make it to the highest rank
Spend a total of 30 hours in Machine Design
Spend a total of 99 hours in Machine Design
Accumulate a total of 250 breaks
Reach #1 in all Unofficial Races(Excluding EXTRA)
Reach #1 in all Grand Prix(Excluding EXTRA)
Reach #1 in all Unofficial Races
Reach #1 in all Grand Prix
???
Complete all titles