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Here's an achievements guide:

Categories:

-B = Beats

-E = Effects

-M = Melodies

-V = Voices

-Ex = Extras (Requirements: Extra Characters option)

-C = Cameos (Requirements: Cameo Characters option)

-S = Secrets (Requirements: ??? option)

- achievement 1: placed the classics (my favorite characters from 2020): B1, B2, B3, B4, E3, V1, V2, V4

- achievement 2: placed the crossovers: V5, Ex 1, Ex 2, Ex 4, Ex 5

- achievement 3: placed the playtime co. characters: E5, M2, M3, Ex 11

- achievement 4: placed the newgrounds characters: B1, B2, E2, E4, V3, Ex 3, Ex 8

- achievement 5: placed the heroes and rivals: B5, E1, E2, E4, E5, Ex 3, Ex 9

- achievement 6: that you already know by just open the "Achievements" tab for the first time

- achievement 7: placed the flash characters: E1, E2, E4, M5, Ex 5, Ex 8

- achievement 8: placed the OSC's: V1, V2, V4, Ex 7

-achievement 9: placed the creator: Ex 12 (Requirements: The Creator option)

-achievement 10: placed the IndieCross characters: B5, Ex 2, Ex 10

-achievement 11: place V5 after M4 is placed

-achievement 12: placed Locke (C1)

-achievement 13: placed David (C2)

-achievement 14: placed Mustardman (C3)

-achievement 15: placed Lobotomy (C4)

-achievement 16: placed all cameos: C1, C2, C3, C4, C5

-achievement 17: placed the betrayer: S1

-achievement 18: placed the chefs: Ex 4, Ex 5

So, that's all of them.