As this achievement requires time (about an hour) and careful planning, it is suggested to get the
out of the way in the same game. I don't recommend going for the Easter Egg at the same time as these two achievements can run the rounds fairly high.
As with any miscellaneous achievement in this game, good
Fate and Fortune cards and
Director's Cut help a ton, but are not necessary. Try not to kill zombies unnecessarily and get good at the arcade games as you'll need at least 600 tickets.
As this is a longer achievement this will be a longer guide...peep the spoiler for the quick and dirty.
*** Spoiler - click to reveal ***- Turn on all 5 power switches
- Activate Power in each area and use the Teleporter back to the Projector Room portal (Pack-a-Punch)
- Enter the Projector Room and hold 
on the table to the left of the soul jar to activate the UFOs
- Buy an Arcane Power Core with 300 tickets for your weapon (can use another on a secondary as well)
- Purchase Golden Teeth from Astrocade (Also 300 tickets)
- Progress past round 10 until a Brute spawns and get him to shatter the Crocodile trap's teeth
- Place the golden teeth in Crocodile trap's mouth (hold on lower jaw) to reveal the crystal core machine
- Complete each Wonder Weapons UFO trap in Journey into Space, Kepler, Triton, and Astrocade areas
- Obtain the corresponding gem in the Crocodile's mouth, and then place it in the Projector Rooms machine for all 4 gems/cores
- Once completed, a purple orb will fly from the Projector Room back to the Crocodiles machine
- Purchase the Exquisite Core from Crocodile trap's mouth for $2000 on your weapon with an Arcane Power Core
Reference these numbers to the numbers within the guide*
THE ARCADE (2)Get that money, son. You'll need at least 600 tickets, so at the end of the round save a few slow zombies and dive into some games.
Rings of Saturn Basketball is your best friend. "SWIIIIISH". You can max out at 120 tickets a turn if you are quick enough (Quickies/Speed Cola do help).
Zombie Zoom maxes out at 50 tickets for a win. The key is to tap the trigger rapidly instead of holding down the water gun spray.
Cryptid Attack nets you 100 tickets for a perfect score.
Black Hole is a bit random, but can give 50 tickets for a jackpot.
Get to the end of a round and keep a few slower zombies to make this easy on yourself. No sense rushing around at the start of a round possibly getting downed.
THE STEPS1) Early rounds just open up the map to get power on. In each area, activate the power switch and then a teleporter terminal. After activating the terminal, hop into the newly powered portal. You will repeat this for every area:
- Journey Into Space (left side of map facing away from spawn) - power switch behind two paid doors. On the wall just before the bumper car area. Teleporter is behind the DJ booth
(Between 4&6).
- Astrocade (after purchasing the Journey door, head right) - Once inside the arcade the switch and teleporter are immediately to the right
(2).
- Triton (straight ahead from spawn) - head up the snowy entrance all the way to the gift shop where the teleporter resides. Up the ramp is the power switch behind a purchasable door
(Between 8&10).
- Kepler (right side of map after leaving spawn) - Head left once up the ramp to see the teleporter. Buy the door leading up to patio to see the power switch
(13).
2) Once all teleporters have been used, turn around and use the Projector Room Portal
(17) to head to the Pack-a-Punch area. Inside, hold
on the table with the tiny UFOs to send them flying into the map. Go ahead and pack your Kendall pistol when you can ($5000) and grab Bombstoppers
(area 15, no explosive damage) and Tuff Nuff
(area 4, extra health).
3) Head to any of the vendor carts around the map and purchase an Arcane Power core for your packed Kendall.
-Begin at any trap in the four areas
(3,4,8 and 12) that has a UFO flying around and get 15-24 kills within
ONE USE of the trap you want and the UFO's exhaust fire will change colors. Best thing is to start a round, horde up all you can, purchase the trap and then run them though.
-Once you've gotten the trap kills, the UFO will start flying around the area, follow it and kill zombies near it (with a weapon that has an Arcane Core) to charge it with souls.
-Once you've filled it with enough souls, the UFO will drop a tiny elemental orb. Hold
to pick it up and put it on the weapon you're holding (as long as it has an Arcane Core).
4) Progress rounds until a large Brute spawns in (usually round 10). Take him to the Crocodile Teeth trap (be careful it closes automatically after you run under it) and run him through as it's closing. He will lift his hand to stop the jaw from clamping resulting in some broken teeth. Dispose of the Brute by spamming head shots to remove his helmet and again to kill him.
5) Purchase the gold teeth from the Astrocade prize counter and install them in the Crocodile trap by holding
on the lower empty teeth. This will reveal a machine behind the Crocodiles tongue.
6) There are four panels on the machine that can be shot off once you've finished an elemental core upgrade (each panel corresponds to a specific core, so shoot them all after you picked up an orb).
7) After shooting the machine panel to reveal a colored gem, grab it and take it to the Projector Room and insert it into the same machine on the left side of the room.
Repeat this entire process for all 4 colored orbs/gems. 8) Once you have placed the 4 elemental gems inside the Pack-a-Punch machine, a purple core will fly out of the Projector Room and fly to the top of the machine in the Crocodile's mouth. Run back to the trap with your Arcane Core equipped weapon and purchase the purple X-Quisite core for $2000 (and pop your achievement).