Third, go on the teleporter room right next to the pyramid (basement) and shot those six electric rod using regular bow. This electric rods are located at the top of the teleporter machine. If you did this correctly, you will hear weird sound means that your on to the next step.
Fourth, Wisp. Find four wisp and shot using your upgraded bow. Total of eight locations. Check this link for the details. Note: 1) if you use a gun, you failed. If you use ordinary bow, you failed. 2) Each wisp has a time, if you dont reach the time. You failed. You need to start a new round in order to spawn the wisp.
Fifth, You need to go on the teleporter and inside of that you will see a purple glowing. Pay 500 points to be teleporter in the past. Once you are in, You need to pick two items (Cylinder and fuse) and codes for the vault. Cylinder will be on your left corner and the fuse will be on the right where there are box, its on the top of it. Last, you need to write it down or memorize the code for the safe vault.
Sixth, Once you teleporter back, go on the death trap and place the fuse. On the opposite side of that there is a switch that says “destroy and protect”. Press action button and switch to protect mode. Now, go over next to the tower and the computer will be activated. Now this is where you have to input the code that you’ve got from the past. If you did a wrong code, you need to start a new round and find again the electric objects to be teleported back to get a new code plus new fuse.
Seventh Next, go down to teleporter room and the vault will be open. Once its open, you need pick up two items. Electric rods and card. Go back again to the death trap and place those electric rods on two post where there are electricity flowing. Then, pull the lever and switch it to destroy.
Go back again to the computer and activate it. once its activated, fourth little screens will give you a weird code and you need to memories or write it down. Next, the big screen on the top will show a code that you need to match accordingly. This is “simon says game” and code that has given are randomly each gameplay. Once you did it correctly, you will hear a chime. To check if you are good to go on the next, look up on the top where you place the electric rod and you will see a current electricity flowing. Next, go to the launch pad area and do the same as what you’ve did. Note: If you made a mistake, you need to start all over again. You can start either way you like. If you done with those two computer, go back to the death trap and at the back, you will see a green lead button. Press on it and a rocket will fall from the sky. Next,go near the rocket and pick up the Golden rod. You need this later.
Eight, Wisp and Tablet. Same procedure on how we find wisp and teleported back to the past. Once you are in the past, you need to pick one more item. Go to the right and look for a book, press action button to open the case. Now this case is on the front of the machine and inside of that there is a stone. Pick it up and you need this later.
Ninth, Golden Rod and Gatekeeper. Go on the altar where you get the bow and below that you can place the rod that you’ve pick up while ago then, gatekeeper will spawn. Follow him, once he stop. Get inside the ring and check below your screen to determine what bow you need to use. Each of four locations has its own bow that need to collect souls. Note: You need to be inside the ring. Once its done he will go on to the next locations. Do the same process. Once he reach on double tap location, You need to place the stone that you’ve got from the past. Look beside him and you will notice that there are a slot, place it and do the same procedure. Once all four locations are done, gatekeeper will come down to the pyramid and he will teleport to the moon. In a few min, he’ll come back. Now, you will notice that each corner has a cylinder and one is missing. Place you cylinder that you’ve got while ago.
Tenth, Boss fight. To start with, make sure that you’ve got a good guns and bring some useful mega gobblegum. Check your ragnarok DG-4 if its fully charged. If you are good to go, step on the tiles where how you activated the anti-gravity and place your ragnarok DG-4. You will teleporter to a room that has no why out but to fight. To kill the boss, you have need to be place your ragnarok DG-4 in the middle where you will see a glow of electricity. Then, gatekeeper will open his chest and thats the time you can weaken him. If your raganarok DG-4 is not charge, you need to hide one of the post because he will create a massive electric wave that will put you down. You have to do this three times in order to kill him but each kill, panzer will spawn. If you manage to kill the boss, you will be teleported back. Now, go on the from of the pyramid where you see a summon key. Pick up and you good to go to the last ending.
Last, Go to the computer next to the tower and place summoning key. Congrats! You unlock the achievement!