Entries 1-11 are skills that you level up or preform.

1. Running: Level up Running once.
2. Jumping: Level up Jumping once.
3. Healing: Level up Healing once.
4. Fortitude: Level up Fortitude once.
5. Collecting: Level up Collecting once.
6. Relationship: Level up Relationship once. (give 50 gems to "The Boy")
7. Interaction: Level up Interact once. (Talk to NPCs or interact with mail boxes.)
8. Sleeping: Level up Sleep once. (ending day 0 will grant this codex entry.)
9. Idle: Level up Idle once. (stand still, no inputs.)
10. Knowledge: Level up Learn once. (completion %)
11. Air Recovery: Preform an air recovery. You do this by hitting the jump button immediately after taking damage.

Entries 12-16 are the skills that you buy. 12. Double Jump - Bought from Joe for 100 gems or Joy for 50 after meeting her special requirement. 13. Dash - Bought from Fingers for 150 gems, or rewarded from fleet by completing his course in under 1 minute. 14. Regenerate - Bought from Gordon(John Freeman's Brother) for 100 gems, or Momma for 50 after meeting her special requirement. 15. Hardinesss - Bought from Brains for 150 gems or Hulker for 50 after meeting his special requirement. 16. Radar - Bought from Junior for 150 gems or Nails for 50 after meeting his special requirement.

Entries 17-30 are NPCS 17. The Girl - You start with this entry. 18. The Boy - Talk to the boy at the beginning 19. Fleet - Talk to Fleet, below your house but above the magma cave. 20. Joy - Talk to her in Earth village 21. Nails - Talk to him in Earth village. 22. Hulker - Talk to him in Earth village. 23. Momma - Talk to her in Earth village. 24. Joe - Talk to him in Sky village. 25. Fingers - Talk to him in Sky village. 26. Gordon - Talk to him in the Church. 27. Brains - Talk to him in sky village. 28. Junior - Talk to him in sky village. 29. Computer - Use the computer in the sacred grounds. (during a 100% run, do this last!) 30. Mains Water Supply - Hit the switch in the small room in the magma cave.

31-35 are enemies.

31. Oiler - Get hit by an Oiler. (black ball)
32. Spiker - Get hit by a Spiker. (spikey stationary enemy.)
33. Big ol Wasp - Get hit by a wasp. (flying enemy.)
34. Frisbee Worm - Get hit by a worm. (worm found in magma cave and mine.)
35. Tyrant - Get hit by a tyrant. You have to touch the tyrant itself, not it's projectiles. Only found under the church.

37-47 are locations.

37. My House - You start with this.
38. Overground - Go to the area above your house.
39. Tunnels - Go to the area under your house (accessed from the west.)
40. Mine - Go to the south east portion of the map. Under the tower.
41. Magma Cave - Go to the very bottom of the map.
42. Giant Tree - Go to the north west corner of the map.
43. The Tower - Go to the north east corner of the map
44. Sky Village - Go to the village, this connects to the north western part of "The Tower"
45. Earth Village - Go to the south west corner of the map.
46. Church - Middle north part of the map.
47. Sacred grounds - Go to the area that is just north west of your house. (doublejump+jumpLvl5 or 100gems needed.)

48-55 are misc.

48. Magical Gems - Collect one gem.
49. Dark Gems - Beat the nightmare boss to obtain this.
50. Huge Gems - Collect one of the four giant gems.
51. Postboxes - Touch a mailbox
52. Lava - Damage yourself on lava in the "Magma Cave"
53. Water Pump - Pull the lever in the little room in the "Magma Cave"
54. Lock - examine the little console right outside of the sacred grounds. You do not need to pay it money.
55. Codex - Open the codex menu.
56. Internet Awareness - Talk to brains numerous times. (I think it's 3 after you have the ability he sells.)