Need clarity on Thuum master trophy

So I’ve been trying to platinum Skyrim on my ps5 and I’ve got mostly all the achievements except this one and I’m confused because I have well over 30 words of power learned and I thought the trophy would’ve BEEN popped but nothing so far. Do I have to have 20 DIFFERENT shouts learned ? Or do I have to learn all 3 words of power for 20 shouts?. God I hope it’s not the latter.