Achievement 1 (Where Did Everything Go)
A rather simple achievement just complete the tasks through the first section till you rebirth the third time

Achievement 2(Blabbermouth) (Miss-able)
After loading into the fps section of the game there are 8 speakers across the 2 rooms 1 in each corner shoot each one and the achievement will appear also do this while collecting the pizza at the room at the bottom of the stairs

Achievement 3 (Unintentional Deadliness) (Miss-able)
After collecting the pizza in the second room after shooting the button shoot the other button to trap the guy the door will open and there are 4 holes containing lava fall into one of them and the achievement will appear

Achievement 4(Fissue Laboratories)
Another easy achievement Just complete the 3 fps levels while collecting all the pizza's through the section

Achievement 5 (Super Jump Friends)
Another easy achievement Just complete the 9 platforming levels while grabbing the pizza

Achievement 6 (A fable of below)
Super easy achievement you unlock for just getting through the section and beating the final boss

Achievement 7 (I can't Believe It's not pizza)
An Achievement for collecting all the pizza's
Pizza Location 1 (Fps level 1 at the bottom of the stairs)

Pizza Location 2 ( Fps Level 2 after shooting the button in the first room its in a hole around the corner)

Pizza Location 3 (Fps level 3 under the starting platform unlocked after shooting a wall and going down the ramp)

Pizza Location 4 ( World 1-2 After seeing the finish line continue going left until a bunch of platforms appear and follow them down till you see the block hit the block and collect the pizza)

Pizza Location 5 ( World 2-2 Continue The level on the intended path until the 3 platform jumps end on the third platform just fall instead of jumping and the block will trigger and be very careful when getting the pizza as you don't want to go to far to the edge)

Pizza Location 6 ( World 2-3 Continue the world as normal will the fall at the end where you hold right when falling so you fall into a massive area and hit a block to unlock the pizza grab the pizza and fall till the level ends.

Pizza Location 7( World 3-? At the start of the level go backwards until you reach a wall from here stand still and spam jump until your all the way up the wall hit the block grab the pizza and continue the world as normal)

Pizza Location 8 ( A fable of below after talking to quacker go to the area left of the castle when you reach the end grab the pizza then enter the castle)

Pizza Location 9 ( After minion fight if you chose to spare him go backwards long enough and a pizza will spawn skip through the text that appears than grab it and continue to the guard guy fight)

Final Pizza (After fighting guard guy choosing to kill him or spare him there will be a hole in the ground if you push forwards after the fight grab it than continue to the final boss and kill him and the achievement will appear)

Achievement 8 (Back To Square One)
A really easy achievement for just clicking your way through duck sim 1 completing the required tasks till you get to the boss where you just have to spam the attack button

Now you should have all of the achievements in Duck Simulator 2 I hope this guide was helpful and got you all the 8 achievements duck sim 2 has to offer