PixelJunk™ Monsters Ultimate

Press ALT+R in-game to start recording, the icon at the top-left will indicate if you are currently recording.
Press the same hotkey again to stop recording and the achievement should unlock.

Trees sometimes contain stashes of coins and gems (maximum of 150 coins and 1 gem per stage on Regular difficulty) which you can find by walking through them. Where and how much you get from them is always random.

An extra large stash consists of 100 coins and 1 gem from one tree.

The best stage for this is Medium 4 - Treeless Forest on Tiki Island since there are only four trees to build towers on.

Just run through the trees and retry until you find an extra large stash.

You can do this on two stages but i'll explain how to do it in Easy 2 - Zen Loop on Toki Island since the basic enemy wave is more grouped up.

I would also recommend doing it with two players (even if you're playing solo) to level up the towers faster.

Start off by placing three cannon towers at the bottom-middle, you will need at least two of these upgraded to purple before wave 8 ends.

Once the first wave is over place some arrow towers around the base, leave them alone and keep focusing on levelling up the cannons.

After the fourth wave place an anti air tower at the middle-right, preferrably the bottom-left tree next to the rocks, and let one player get it up to red while the other keeps focusing on the cannons and placing more arrows.

Unlock the mortar tower as soon as you get 15 gems and place it at the top-left close to the rock. Sell the cannons if you're on wave 8 and don't have enough coins/gems to buy the mortar. Upgrade the mortar to purple and see what is about to unfold on wave 9.

...BOOM! The achievement should now unlock.

This achievement can be done as soon as you unlock the Remote Mines (Bomb) for completing Special 3 - Gold Rush! on Gati Gati Island.

I would recommend playing the medal challenge "Bomb The Boss" for this one as you need to defeat the boss using only bombs.

Make sure to sell all of your towers before the final wave since any shot hitting the boss voids the challenge.