To do all the tutorial lessons go to, Main Menu > Single Player > Sing it Pro. There are five lessons you need to complete to get the achievement. They are Warm Up, Pitch, Accuracy, Breathing, and Harmony. Complete those five lessons to get this achievement.

To get this achievement all you have to do is sing all the High School Musical songs. There are seven total High School Musical songs.

They are:

To get this achievement all you have to do is sing all the High School Musical 2 songs. There are eight total High School Musical 2 songs.

They are:

To get this achievement all you have to do is sing all the High School Musical 3 songs. There are ten total High School Musical 3 songs.

They are:

See the "Complete 100 songs" achievement below.

There are only some many songs in this game so you will have to sing all of them twice and some of them three times. It does not matter how well you do on the songs just make sure you complete 100. You might want to keep track of how many you've completed. To make the songs go by faster you can go into Single Player > Gig Mode and add 5 songs. After you do that you can just let them play since you can not fail a song in this game. The shortest songs in the game are "Bop to the Top"(HSM1), "Get'cha Head in the Game" (HSM1), "Just Wanna Be With You" (HSM3), "Right Here, Right Now" (HSM3), and "Now or Never" (HSM3), and "Fabulous" (HSM2).

You can check how many songs you have sung by going to Main Menu > Personalize > High Scores. Then click on "Combined High Scores" and it will tell you how many songs you have sung so far at the top.

Go into Single Player > Solo and simply complete all the songs below.

The 25 songs you'll need to sing are:

High School Musical:

Do the same thing as the "Sing it Superstar" achievement except sing all the songs in Duet mode instead.

You should get this after your first song. The game has a leaderboard set up already in the game with scores, which are very low. You should easily be able to get a top score on any song you sing. You can play on Easy for the first song and easily get this achievement. I recommend singing a song that you already know to try and get this achievement.

To do this go to Main Menu > Mutiplayer > Gig Mode. Simply select any song, it can be more than one if you want but one is enough. Just complete the song and the achievement will unlock. If you have nobody to sing with you and you have 2 microphones you can get this achievement by yourself just sing with both microphones. Its very easy. Play on Easy difficulty to make the song easier. 

To do this simply go to Main Menu > Single Player > Gig Mode. From there, select any song of your choosing and hit "Start" in the bottom right-hand corner. Complete the song and you will get this achievement.

This game mode is a little different than the others. You get no notes nor do you see how well you are doing in the song. You just simply sing the song and watch the music video. So I suggest choosing a song you know so you don't fail the song and can easily complete it. To do this go to Main Menu > Single Player > You're on your own!.

You can easily do this by yourself, just make sure you have two microphones for you to use. To play a Team Play mode song go to Main Menu > Multiplayer > Team Play. Now make it to where there is one person on each team and select any song. Complete the song and the achievement will unlock.

If you have two microphones you can also get this achievement by yourself. To play a Duet mode song go to Main Menu > Multiplayer > Duet. Select any song to sing and complete the song.

Once again if you have two microphones you can get this achievement by yourself without anyone's help. To play a Versus mode song go to Main Menu > Multiplayer > Versus. Select any song to sing and just complete it.

To play in the You're On Your Own mode go to Main Menu > Single Player > You're On Your Own. This mode consists of no words to the song or how well you are doing. It's just you singing so select a song you are familiar with and know most of the words to. If you don't get it the first time singing that song, sing it again as you will only get better with time.

You can do this with two microphones by yourself, as it is very easy to sing and you can easily get 1,000,000 points with that song. If you can't do with the two microphones by yourself try to get a friend or family member to help you out with this. Pick a song you both know very well and sing through it and complete it. If you don't have over a 1,000,000 points after the song don't worry as you get some extra points when you get to the score screen after the song if you did get enough.

You should get this with the first twenty songs you sing. If you do not then while you're going for the "Sing all 100 songs" achievement you should easily get this achievement as scoring 500,000 points is very easy. If you think you can master Normal or Hard difficulty, do that but obviously it's easier on the Easy difficulty.

You can check how many songs you have over 500,000 points on by going to Main Menu > Personalize > High Scores. Then click on "Combined High Scores" and it will tell you how many songs you have sang and their total score. Count the ones you have completed and gotten over 500,000 points on.

Just like the "You got what it takes" achievement you should get this with the first twenty songs you sing. If you do not, then while you're going for the "Sing all 100 songs" achievement you should easily get this achievement as scoring 750,000 points is not real easy but it is certainly not difficult to do. If you think you can master Normal or Hard difficulty, do that but it's obviously easier on the Easy difficulty. Start off by singing songs that you know.

You can check how many songs you have over 750,000 points on by going to Main Menu > Personalize > High Scores. Then click on "Combined High Scores" and it will tell you how many songs you have sung and their total score. Count the ones you have completed and gotten over 750,000 points on.

See the "Hey! Big Scorer" achievement above.

See the "You're a Professional" achievement.

To play in Versus mode go to Main Menu > Multiplayer > Versus. This one is very easy to obtain. Use both microphones if you have nobody to sing with you and choose a song that you know and that is a pretty long song to sing. Don't forget you get extra points for having multipliers, without them you will not get 750,000 points in a song. If either of the microphones go over 750,000 points you will get this achievement since both microphones are signed into your profile.

To play in Duet mode go to Main Menu > Multiplayer > Duet. Now pick a song that you know or if you have someone singing with you a song that you both know. Play on Easy difficulty. If either one of the microphones gets over 750,000 points you get this achievement, it does not have to be Player 1's microphone since both the microphones are signed into your profile. You can do this with two microphones but it is a tad difficult to get 750,000 point that way.

Select a song that you know and that you know you can sing along well too. 750,000 & 1,000,000 points sounds like a lot but it is actually not. If you start singing well during the song you will get a 2x multiplier, then if you keep singing well you will get a 3x multiplier, then a 4x multiplier. You can easily get between 50,000 to 100,000 points if you get a 2x multiplier and more if you get 3x & 4x multipliers. So the higher your multiplier during the song, the higher your points will increase.

You get multiplier's by doing well during songs. If you start singing well, you will get a 2x multiplier and if you keep singing well while that multiplier is up, the multiplier will increase to up to 4x, the highest multiplier in the game. If you mess up during the multiplier, the multiplier will reset. You will also get a multiplier after the song is over and it will be anywhere from 1-4. If you don't get a 4x multiplier during the song, but you get it after the song during the Score screen you will still unlock this achievement.

Also, when you get a 2x multiplier the notes will turn red. When you get a 3x multiplier the notes will turn orange. Finally, when you get a 4x multiplier, the notes will turn to gold. That's one way you know when you get a multiplier.