One of the more obscure Achievements is the one called Sing the Iron Song, where you have to play the Rise of Iron theme music on the bells in the Iron Temple. Though this particular Achievement doesn't really get you anything useful, completionists will want to figure out how to get it. Sing the Iron Song involves listening to the Rise of Iron theme, then replicating it on some bells of different tones just from hearing the song and experimenting with the tones. This can be tough if you aren't a musician. Here's how you get the Sing the Iron Song Achievement for those without an ear for music.
For more tips and hints for Destiny: Rise of Iron, visit our Destiny: Rise of Iron Guide Hub.
To play the song, you first need to gain access to the bells. Complete the first two missions of Rise of Iron to unlock the Iron Temple Social Area at Felwinter Peak. After you do, land at the Iron Temple. Take a moment and listen to the music that plays while you're in this area, as that is the song you're supposed to be replicating. From where you spawn, head to the top of the stairs where the main door to the temple is, across from Lord Saladin. Enter the temple here to find Tyra Karn. Continue behind her to find a great hall where you can attune gear. Encircled around this hall is a hallway which houses seven bells - one on one side and six on the other.
For this part, you're going to need another player to help out, though having more than that makes it easier. Five players is the most ideal number, as that's how many bells will be used to play the song. If we label the bell that's by itself as 1, and the rest as 2-6 from left to right, then playing the following pattern one note directly after the other will get you the Trophy: 1 - 2 - 3 - 1 - 5 - 4 - 3 - 2 - 3 - 1. Note that the bell that would be labeled 6 is not played. The notes need to be played one after the other, so don't be afraid to start the next note before the preceding note is played since there's a delay between when you trigger the bell and when the note is played. If you did it right, then you should get the Sing the Iron Song Trophy immediately after playing the final 1 note.
It may take you a few tries, so coordinate in voice chat if you can. If you can't, listen for the tune as the bells play to figure out when your cue is. And also bear in mind that the notes listed in this guide is not the whole song, which is at least a couple of measures longer. We tried several configurations during testing, some with more notes and some with less, but we can confirm for sure that the ten notes listed do in fact work, so play those to be guaranteed that you'll eventually get the Trophy.