Tardis Spawns four times total. You need to just headbutt it at each location.
Carrier unlocks at $20,000 and the Teleporters unlock at $25,000. So you will need $25K at least
1st - in the space flight museum upstairs
2nd or 3rd - On carrier opposite side from portal on walkway stuck in a pipe (either of these two locations)
2nd or 3rd - in the academy dome in centre by statues (either of these locations)
4th - research dome next to the 3D printer room
Once you get to the forth location a portal will spawn. Walk through it to a swimming pool and the achievement will unlock.
I recommend while you're there getting the collectable trophy which is on the high diving board.
Thanks For Watching.