Age 28 - What would you recommend for these mild acne scars? (photo)

At least from the photos provided, the vast majority of acne scars appear to be of the Indented rolling acne scars variety. What's more the majority do not look to be particularly deeply depressed.
If this is indeed so, then individual subcisions would help to elevate and smooth them.
Subcision, which I have been performing with gratifying results for thirty years, has a several decades' long track record for safety and efficacy for elevating and smoothing acne boxcar and rolling scars.
For old, so- called "mature" scars, one can reasonably expect a 60-80 percent overall improvement in appearance. Although some people achieve this after just one treatment sessions, the majority will require on average about three treatment sessions (spaced at a minimum of six week intervals, the time it takes for the person to produce one's own new collagen and new elastic fibers--which is responsible for the typically long-term to permanent cosmetic improvement).
No doubt, in your research you will be bombarded with claims for the benefits of treatment with this or that, expensive, supposedly "next big thing" laser or RF device. Just be aware and exercise a great deal of 'buyer beware" caution when evaluating these options, since the hard science to back up the claims for these gizmos lags well behind the heavy marketing hype and social media buzz to hawk them.
You would be wise to make sure to consult with an experienced, board certified cosmetic dermatologist acne scar treatment specialist. Hope this helps and best of luck.

Acne scars are usually characterized within the subtypes of atrophic, hypertrophic, pigmented, or inflammatory. These subtypes of acne scars can be visually discerning in ambient light and can cause significant cosmetic concerns. Indented and atrophic scars require a combination approach to stimulate collagen and elastin, thereby smoothing contour and uneven skin. These are usually combined with lasers and depigmentation protocols to reduce inflammatory hyperpigmentation (Melarase AM and Melarase PM). Our Hidef protocols for acne scars include fillers such as Sculptra, Juvederm, Radiesse, and Restylane to improve deep acne scars; Vascular lasers to reduce inflammation and post-inflammatory redness and erythema; Fractional lasers to smooth contour and collagen; and Fractional RF to stimulate production of collagen within atrophic scars. Textural improvement and superficial scarring can be improved with Cosmelan peels, TCA Cross for ice-pick scars, deep chemical peels, and fractional CO2. We offer a personalized approach to your combination of scars and a formal evaluation with consultation is recommended to help you achieve your final results. Our plastic surgery office offers subcision and combination TCA Cross to help reduce deeply pitted scars. In terms of pigmentation and skin resonance, we recommend daily use of Melarase AM and Melarase PM coupled with Retinoid creams to achieve brilliant skin.

Best,
Dr. Raffy Karamanoukian
Realself100 Surgeon