The "Microsoft Certified Partner" badges and similar badges in other technology areas are often used for this. The theory is that because they have a large and extremely well known brand like Microsoft on them, they will work well. And that they hint at some sort of professional qualification & certification process.
Something else: I have been looking for unbiased evidence that these kinds of badges actually work (inspire more trust/improve conversion rate) for a couple of years now. I have not found any evidence yet. Of the materials that I've seen so far, the positive whitepapers claiming that these badges work are from organizations selling these badges...
So if somebody has evidence that these badges work, I'm listening. Until I've seen such evidence, I would suggest that OP should not go overboard with many badges, or perhaps A/B test different badge combinations first.