I've officially been poking around in this game's files for too long but I have finally found not only how to get it in fullscreen but also how to get the second achievement that seems to be broken. 

They're all separate games but on a technical level the files are interchangeable. So... that's what I did. 

Eu acredito que você clicou aqui neste guia porque estava preso na segunda fase do ICE TEMPLE ou nas fases do WIND TEMPLE porque o fireboy e a watergirl está andando ou pulando muito lento em comparação com o tempo e o cenário e os objetos. (pelo menos foi 

Felt like the two speed forest stages felt wrong? Well, that's cuz it had no appropiate music!