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A few of the hidden achievements if you’re having trouble: The singing frog is at the lake of “Sape Oasis.” The mermaid appears in the upper left of “Buccaneer’s Den.” The SOS bottle appears in the river of “Snapvine Bridge.” The alien hunters can be found at the upper left of “Crimson Valley,” the upper right of “Snapvine Bridge,” and the upper middle of “Lost Jungle.” Dr. Walton is the monkey that appears in wave 6 of “Temple of Saqra.” Click the runes below: middle, left, right. Hope this helps.
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KorbanG, have you even tried the challenge modes or even played the game in normal or veteran?. In the challenge modes you have no heroes and restricted upgrades and towers to use, combine that and veteran difficulty and you pretty much are gonna be stuck forever in this game (unless you watch a video or something :I)