Here is the full list of all 10 Let's Sing 2018 (UK) trophies - there are 4 bronze, 5 silver and 1 gold.
Get 10 gold records
Get 10 platinum records
Get 10 diamond records
Win 50 missions
Reach level 50
Finish 100 % of the CLASSIC mode
Finish 100 % of the FEAT. mode
Finish 100 % of the TV mode
Finish 100 % of the MIX TAPE mode
Sing 30 different songs