Hey, I am an artist and I love using acrylic colors. I generally use the process of varnishing to give the final coat to my acrylic paintings. Varnish comes in gloss, satin or matte finish. I usually stick with gloss varnish because I love the look of a glossy finish, but you may have your preference. You can mix any of these types of varnish to get the exact finish that you are looking for, but it will take some experimenting to find the best fit for you!
Keep in mind that point : you’ll never obtain oil paintings with anything except oil paint. You’ll have something different, very nice, but it will not be oil painting. Acrylic and oil don’t have the same refraction index. That means that light will