1. Go to Play Now.
2. Pick the teams.
3. Go to game settings - quick settings and make sure it's on rookie.
4. Back out and start the game.
5. Win the opening faceoff then go into your zone and pause the game. Go to manage teams and pull the goalie.
6. Remove the batteries from your controller, place them back in and reconnect the controller and back out of the menus.
7. It will now ask you to pick a team after reconnecting the controller, pick the opposite team. Get the puck and go down the ice and score with the proper deke. Just make sure you have room to pull the deke off and not get poke checked.
How to do a one handed tuck deke : When you are holding the puck out away from you, hit both bumpers close to the net. The puck will go the opposite way you are holding the stick. If you are holding it out forehand with a left handed player the puck will go low right side.
Here is an example clip
http://imgur.com/tkjf34kThis one is the easiest of the three new achievements tied to the new dekes. You could probably get this by just messing around in practice mode while the other two I recommend an empty net.
Edit 1 : For those having issues try coming in on an angle like this clip here
http://imgur.com/IDxtYTf or try making the goalie move with you and do the deke away from him like this
http://imgur.com/1QbYQ61 If anyone is having a tough time with it just PM me and I can help you out in game.