Here is the full list of all 8 Grave Matters achievements.
Prove yourself a pro in The Prologue.
Make a run, in Act 1.
Dig on through, in Act 2.
Persistence is key, in Act 3.
Stop walking so slow! Upgrade your Boots.
Get Luckier! Upgrade your Hat.
Stop running out of time! Upgrade your Watch.
Smell Better! Upgrade Bobby.