Here is the full list of all 16 Splice achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Solve each Strand in Epilogue Sequence 4.
Complete all Sequences in the Epilogue Series.
Solve all Potential Angelic Strands.
Solve each Strand in Epilogue Sequence 3.
Solve each Strand in Epilogue Sequence 2.
Solve each Strand in Epilogue Sequence 1.
Solve each Strand in Sequence 7.
Complete all seven Sequences in the Origin Series.
Solve each Strand in Sequence 6.
Solve each Strand in Sequence 5.
Solve each Strand in Sequence 4.
Solve each Strand in Sequence 3.
Solve each Strand in Sequence 1.
Make your first Splice.
Solve each Strand in Sequence 2.
Solve a Strand with one or more Splices remaining.