Dude, just use the common sense. Grind peanuts, put some sugar coz I remember that achar is kinda sweet, put some salt, red pepper... now the tricky part is to make it a paste... I assume they put some liquid to make it the paste... is it water? It's not milk, it's not soy milk, it's not peanuts milk, it must be water. Voila, throw some water, and ur achar is ready. I am sure they also put something else... hmm, it has kinda sweet and soury taste ... how about a squeeze of lemon/lime ... and a dab or two of soy sauce?

Oh btw ... I've never made it in my life.