It's funny but really difficult.
1. The backbone: motherboard.
2. LCD screen with frame. [product|IF124-001]
3. Rear case with side buttons. http://www.witrigs.com/oem-back-cover-with-side-buttons-for-iphone-5s-gold
4. Front camera with proximity sensor assembly. [product|IF124-010]
5. Rear camera. [product|IF124-008]
6. Home button flex. [product|IF124-013]
7. Side button flex. [product|IF124-012]
8. Wifi antenna flex. [product|IF124-014]
9. Lightning dock assembly.(with headphone jack and MIC) [product|IF124-010]
10. Vibrator. [product|IF118-012]
11. Battery. [product|IF124-008]
12. Loudspeaker. [product|IF124-016]
13. Earpiece. [product|IF124-005]
14. Screws. [product|IF124-009]
15. SIM card tray. [product|IF124-011]
16. LCD sheild. [product|IF124-006]
17. Kinds of metal bracket, rubber and sticker.(you can find from some third party)
http://www.witrigs.com/oem-charging-port-retaining-bracket-for-iphone-5s
http://www.witrigs.com/oem-wifi-retaining-bracket-for-iphone-5s
http://www.witrigs.com/oem-home-button-metal-bracket-replacement-parts-for-apple-iphone-5s
http://www.witrigs.com/oem-earpiece-flex-cable-bracket-replacement-parts-for-apple-iphone-5s
That's all i can remember, maybe there are something more, but above all can't miss.