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Portal to Everywhere
Collect each of the following devices that allow for intradimensional travel.
Portal to Everywhere is a 5-point collection achievement requiring you to obtain all 11 wormhole generator and transporter toys, each of which can be purchased on the Auction House or crafted through Engineering.
Obtain Classic Engineering toys
Acquire 
Ultrasafe Transporter: Gadgetzan and 
Dimensional Ripper - Everlook — their recipes are sold by Jhordy Lapforge (Gnome Engineering specialization, Classic Engineering 260/300) and Zap Farflinger (Goblin Engineering specialization, Classic Engineering 260/300) respectively. Both toys can also be purchased on the Auction House if you prefer not to craft them.
Obtain Outland Engineering toys
Acquire 
Ultrasafe Transporter: Toshley's Station and 
Dimensional Ripper - Area 52 — their recipes are sold by Smiles O'Byron (Gnome Engineering specialization, Outland Engineering 50/75) and Kablamm Farflinger (Goblin Engineering specialization, Outland Engineering 50/75) respectively. Both toys can also be purchased on the Auction House.
Obtain Northrend Engineering toy
Acquire 
Wormhole Generator: Northrend, which requires Northrend Engineering at 40/75 to craft, or purchase it on the Auction House.
Obtain remaining Wormhole Generators
Acquire 
Wormhole Generator: Pandaria, 
Wormhole Generator: Argus, 
Wormhole Generator: Kul Tiras, 
Wormhole Generator: Zandalar, 
Wormhole Generator: Shadowlands, and 
Wyrmhole Generator: Dragon Isles — all of these can be crafted through their respective expansion's Engineering skill or purchased on the Auction House.
Tips
If you do not have Engineering, buying all toys on the Auction House is a valid path to the achievement without any crafting required.
If you do have Engineering, crafting the toys yourself may be cheaper than purchasing them on the Auction House, depending on current material prices.