ATTENTION: Title Update 12 occurred on August 23rd, 2013. Since then, I wasn't able to find any of the saddle locations previously stated to be in the Tutorial world. But I have found one all on my own since the newest update, and will share it with you guys, it should be there.
So after the latest update, load a Tutorial world, have your map out and go to the point.
X: -38 Y: 61 Z: 7
You should be in a dungeon and a see a mob spawn, open the chest and a saddle should be in there. This worked for me. I would like to know feedback on this solution if it appeared there for others since the update, if so, great. If not, I will take this down. I just want to let everyone know.
Once you have a saddle, I went to the stables where animals are pinned in fences (close to the location of the saddle), it's just down the steps of where the castle is. You can go farther down and destroy the fences that are around the wheat, just across from the stables, Then go back to where the pigs are fenced in. First, from the outside of the fence, dig a pit, I would be safe and go at least 6 or 7 down and maybe 4 or 5 long and wide. Then get yourself out of the pit. A useful thing is to have dirt out and then jump and place, jump and place, until you get back to the top. Then fence around where you have dug. Then get in the where the pigs are, I'd highly advise saving, so if anything goes wrong, you can dashboard and load up again. After that, you can then delete the fence blocking the pit, and put the saddle on one of the pigs, hit it with nothing equipped so it won't kill it easily, and it will start to run around inside the fenced area, it might try to run to the opposite side of the fence, if that is the case, just keep fencing inside so it keeps pushing it farther and farther to the edge. Try and wait until it is facing the direction of the pit, then it will run right off and the achievement it yours.
Again, please let me know whether or not this solution worked for you, I tried my best to describe what I did. Thanks!