Before start issues
Go to game properties (rightclick in library)
… and then type “-dx11” into the launch options.
Open the first 3 maps and close them over the ESC menu
Finding the secret map
First it teleports you on the other side of the same map also with 4 trees. Go inside the square again.
Now game is loading and you are on the secret map.
Completing / Failing a quest (Quest1)
On the secret map head to the tunnel (but do not enter the tunnel, yet).
Try to cross the hills next to the tunnel (maybe also backwards if it doesn’t work. Reset your car with R each time you are stuck)
Drive back to the rocky parts where a lambo is stuck
Use both of the dialogue options which appear next to the lambo
Completing / Failing the tunnel quest (Quest2)
The tunnel inside looks like an U. So you have to turn 2 times right until you reach the end of the traffic jam.
Be careful to not hit & bust the middle planks. They can cause glitchy shards which can make your car stuck forever.
Choose both options of the dialogue. (you don’t have to fulfill the quest)
Now you are done with all achievements. If you still want to fulfill the quest you can pass by the traffic jam and turn left to the tunnel exit at the end.
By bigh ◢ ◤