Here is the full list of all 15 LoFi Kitten achievements.
Collect 1 Vinyl Star
Collect 25 Vinyl Stars
Collect 50 Vinyl Stars
Collect 75 Vinyl Stars
Collect 100 Vinyl Stars
Collect 1 Cassette Tapes
Collect 25 Cassette Tapes
Collect 50 Cassette Tapes
Collect 75 Cassette Tapes
Collect 100 Cassette Tapes
Collect All Vinyl Stars
Collect All Cassette Tape
Play a stage with the golden set
Check the credits
Unlock every Achievement