Here are some powders that are safe for acne. There aren't many in the list because it's hard to find talc-free powders, but I'll show you some that I use and that won't make your skin worse.
lightweight powder with full coverage
ORIGINAL Mineral Veil® Setting Powder - bareMinerals
The best powder for smoothing and concealing imperfections. It also provides good coverage, mattifies, and covers.
Poudre Fixatrice Cloud Set - Kosas Cosmetics
Very light loose powder with excellent coverage, ideal for those who want coverage without heaviness.