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