The ammo upgrades/pickups are sequential in their naming procedure, so the first one you find will always be ammo+ in the menu powerup section, the next ammo++ and then ammo+++.
Developer logs are also not included in the final level stats.

In order to get the final true ending as well you must collect all of the sparks (things that unlock certain level areas) and finish the story from start to finish ie: new cycle

Every level contains 4 T-logs, 4 Audio tracks, 2 sparks and a Developers Log.

Additionally this will help you in getting "Cartographer", (which allows you to get "Breaking The Deadlock"), 5 Bros, Archivist, Music-Loving and the Inner Power achievements.

In case people want to know what levels the powerups inhabit, without a video spoiling where they are hidden. Here you guys/gals go

Ammo upgrades:
Level 1, 2, 5

Dash upgrades:
Level 3 Dash skill
Level 2 Gauge +
Level 4 Refill +

Blast
Level 5 Blast skill
Level 3 Rocket Jump +

G-mod
Level 4 G-mod skill

This level contains the ammo + upgrade

Timestamps for easy lookup:
0:00 T-log 01
0:16 Audio Track-Purple Skies
0:45 Dev log-Fabien
1:20 Audio Track-Shining Gate
1:38 T-log 03
2:26 Audio Track-Raining Asteroids
2:53 Spark Alpha Phoenicis (impossible to miss)
3:24 T-log 04

Revisited with dash and rocket jump. Therefore some may not be collectible without these upgrades

3:49 Spark Beta Centauri
4:08 Audio Track-Negative Wave
4:25 T-log 2
4:51 Ammo+

This level contains 2 character upgrades (ammo++ and gauge+)

Timestamps for easy lookup:
0:00 T-log 05
0:20 Audio track It, My friend
0:36 Dev log Adrien
0:55 T-log 07
1:14 Spark-Gamma Lyrae
1:42 Audio Track Infinite Rings
2:00 T-log 08

Revisited with dash and rocket jump- Therefore some may not be collectible without these upgrades

2:15 T-log 06
2:41 Ammo++
2:58 Spark-Delta Corvis
3:16 Audio Track TimeTrap
3:46 Audio Track Reborn
4:10 Gauge+

This level contains 2 more character upgrades (Rocket Jump+, Dash powerup)

Timestamps:
0:00 Dash
0:37 T-log 09
0:47 Rocket Jump +
1:11 T-log 10
1:38 Timeless
2:02 Spark-Epsilon Pegasi
2:30 Dev log-Antoine

Revisited with upgraded dash and rocket jump- Therefore some may not be collectible without these upgrades

3:07 Spark-Zeta Aurigae
3:40 Razor Dust
4:28 The Hive
4:28 Clouds in the void (following the hive audio track)
5:13 T-log 12
5:18 (easy way to T-log 12)
5:29 T-log 11

This level contains 2 character upgrades (G-mod, Refill +)

Timestamps for easy lookup:
0:00 Audio- Black hole
0:10 G-Mod
0:20 Refill +
0:37 Dev Log Arnaud
0:57 T-log 13

1:15 Spark- Eta Persei (used charge+rocket jump to access, without those upgrades
player will need to traverse pathway at 1:17, and then come back in order to reach
the G-mod area at 1:34)

1:50 T-log 14
2:11 Spark Theta Cassiopeiae
2:23 T-log 15
2:45 T-log 16 (try with either all dash upgrades, or with the fan on)
3:03 Audio- Jaws
3:54 Audio- Fog Escape
4:05 Audio- Solar Wind

This level contains 2 character upgrades (Blast skill, ammo +++)


All Collectables for DeadCore level 5
Timestamps:
0:00 Spark-Iota Carinae
0:13 Blast
0:22 T-log 17
0:33 Audio- Back of Distortion
0:57 Ammo +++
1:14 Audio- Diffraction
1:28 T-log 18
1:56 Dev Log- Aymeric
2:20 Spark- Kappa Orionis

2:37 T-log 19 (much easier to use this path with both dash upgrades, otherwise you will need to fall down from one of the reactors that activates the final jump pad
[this reactor makes you fall down the side of a tower to a wall-jump pad when its activated])

3:30 T-log 20
4:11 Audio- Eternity Towers
4:37 Audio- Journey

Woohoo, finished.
Hope this helps someone find that last elusive collectible.

Phantom OUT!