For these achievements I would pick level 1 and build 3 cannons anywhere on the map. As soon as you can upgrade the cannons to level 3 and then leave them until about the 12th wave, at that point build 2 more cannons to level 3. This set up should get you until wave 20 which is when you need to sell all 5 towers do this as quickly as you can as you get about 20 seconds after the wave completes before the game stops you doing anything and goes to your score page. As long as you sell all 5 towers you should pick up all 3 achievements.
I have included a video below in case you want more help and guidance.