Here is the full list of all 21 Hot Heat Reset: Chapter 1 achievements.
Unlock a new playable character
Get a coin destroyed with fan blades
Complete Chapter 0: Revision
Launch the game for the first time
Open "Readme" once
Retry a level immediately
Replay a level and get a better grade
Get a "Hunter" speedster tag on any level
Get an A* on any level
Get an A on at least 5 levels
Get an A on at least 10 levels
Get an A on at least 15 levels
Get all speedster tags at least once
Complete all objectives at least once
Cause a chain reaction with 3 time bombs
Cause a chain reaction with 4 time bombs
Skip a set of dialogs
Complete Chapter 1: Unguarded
Complete Level 20 with "Screen"
Plant 100 Time Bombs
Shoot 100 Cannon Bombs