I set out to try and beat all the AI's on master level to get the theme reward unlocked. After getting through all the others, I went up against Stephen Fright. I won the level but I received no achievement. I thought that maybe i hadnt change the AI to master, and so i played the level again, beat him again but still with no achievement...
I have won against the Stephen Fright AI about 5 times now and Im starting to lose heart....please help...(all the other master AI achievements have been given)
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