Skills...
	Various Steam Achievements...

Fill all three slots under Number 1 (where you can have the numbers 1, 2, 3, and 4 set to load functions). Now you can drag and move Number 2 left to replace Number 1, and suddenly Number 2 will have all slots accessible. Meanwhile, Number 1 doesn't lose any of the loaded functions. This makes it easier to max out individual function sets without having to level up your character.

Achievement	How to unlock
Agency	Complete each Agency Test
Align	Achieve User Level 8.
Anything	Deal at least 1024 damage in one Turn in the Practice Test.
Bet	Complete five encounters with one or more Limiters in use.
Bracket	Confront Royce beyond Cloudbank.
Bye	Complete the story.
Contest	Clear every Test.
Dare	Complete five encounters with five or more Limiters in use.
Drive	Reach the Goldwalk District.
Everything	Deal at least 2048 damage in one Turn in the Practice Test.
Find	Inspect 10 completed Function Files.
Focus	Achieve User Level 16.
Function	Unlock every Transistor Function.
Goodbye	Recurse through the story.
Kendrell	Confront Grant and Asher at Bracket Towers.
Limiter	Unlock every Process Limiter.
Memory	Unlock 32 MEM.
News	Use 10 different OVC Terminals.
One	Achieve User Level 24.
Performance	Complete each Performance Test.
Planning	Complete each Planning Test.
Process	Inspect all completed Limiter Files.
Reisz	Confront Sybil at the Empty Set.
Reveal	Inspect all completed Function Files.
Risk	Complete five encounters with all 10 Limiters in use.
Sandbox	Clear one of each Test.
Search	Inspect five completed Function Files.
Self	Upgrade a Function with a copy of itself.
Speed	Complete each Speed Test.
Spine	Confront the Spine at the Bracket Towers facade.
Stability	Complete each Stability Test.
Stack	Create a Function combination requiring 12 MEM.
User	Unlock every Upgrade Slot and Passive Slot.