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