This achievement will be immediately after installing the boost upgrade.
1. Install the boost upgrade.
2. Start the fire to power the boat.
3. Get the gauge in the blue and keep it there.
4. Make sure the fuel doesn't run out, or it will disrupt what you're doing.
5. Your engine WILL overheat, so water it down to cool it.
6. When the blue has fully charged, a button at the top front of the inside of the boat will pop out. Push it.
7. This will push the boat, and the gate will open.