You Shall Not Pass Achievement
If someone play this game, here is my solution for this achievement:
On the first picture you can see all traps I set and where they are, so I write only the setting order.
First you set the barricade and after that the first black hole trap under the barricade. Then set a dart trap und upgrade it till push back ability. After that set a spike trap or a second dart trap. The first rounds you will made it with this combination. Next you set a second black hole and an inferno trap. After that, set a spin blade trap.
Set spike traps and upgrade all traps in next rounds:
Short trap level and gold level overview: