Stick with Reimu for this, even though shes the starter character shes meta.

1: Start the game

2: Start a run

3: kill an enemy

4: Kill each boss respectively

By this point i recomend using sakuya from now on

1: no hit every boss

2: beat the game with 3 different characters (suggested: sakuya, reimu, and cirno)

3: collect 500 coins

1: no hit the entire game (use Ruima for this, her high damage output is a LIFESAVER)

2: Beat the game with 5 characters (Reimu, Cirno, Sakuya, Ruima, and Remilia)

3: unlock all achievements