This is an updated list of the Maximum Tradeskills Needed.
I mentioned the top 2 tradeskills. The ones in parenthesis aren't really tradeskills (Nano Controller Unit is nodrop)
ME: 2100 - 5 Gem aruls / 1800 - Rod rings 6xQL.
EE: 2270 - 5 Gem aruls / 1800 - Rod rings 6xQL (1800 for QL300 Nano Controller Unit 6x).
QFT: 2025 - ql300 Shiny Jobe Clusters 6.75x / 1562 - Combat Knowledge Crystal+Medical Knowledge Crystal, other steps
WS: 2025 - ql300 Shiny Jobe Clusters 6.75x / 1800 - Alien weapon upgrade 6xQL.
NP: 2025 - ql300 Shiny Jobe clusters 6.75x / 1875 - Crystalised Memories Mechanic+Technician, other steps
Pharma: 2025 - ql300 Shiny Jobe Clusters 6.75x / 1800 - Alien armor 6xQL.
Psychology: 2025 - ql300 Shiny Jobe Shiny Clusters 6.75x / 1800 - Alien armor 6xQL.
Chem: 2100 - Alien armor from Mutated 7xQL / 1750 - Crystalised Memories Doctor+Surgeon (1800 for QL300 Nano Controller Unit 6x)
CL: 2025 - ql300 Shiny Jobe Clusters 6.75x / 1800 - Placing ql300 towers 6xQL
B&E: 1400 - ql200 nano rifles 7xQL / 1200 hacking leather armor 6xQL
Juat in case you wonder what Jobe clusters I mean:
Psychology: Skill Time Lock Modifier, Nano Formula Interrupt Modifier, % Add All Off., % Add All Def., % Add Xp
FQT: Shield AC, % Add. Dam., Energy Damage Add, % Add. Nano Cost -
Pharma: Heal Delta
CL: Max NCU
WS: RangeInc. Weapon (says % Add.Rad. Dam.)
NP: RangeInc. NF (says % Add.Rad. Dam.)
However, these are note the absolute maximums you can ever need. The reason is that clusters can also be used to push the ql of the imp ahead. For a shiny Jobe cluster to push the ql of the target 1 ql you need 400 more than the requirement.(tested). The maximum possible gain is +5 for ql250+ imps (not tested for obvious reasons). So the real maximums for imps are achieved with ql295 imps. I think the req for that is 1991, so the max is 3991. Of course there is no way to test this since such numbers are not achievable. But just for the sake of completeness, the absolute maximums:
ME: 2100 5 Gem aruls
EE: 2270 5 Gem aruls
QFT: 3991 - ql295 Shiny Jobe clusters made into ql300 imps
WS: 3991 - ql295 Shiny Jobe clusters made into ql300 imps
NP: 3991 - ql295 Shiny Jobe clusters made into ql300 imps
Pharma: 3991 - ql295 Shiny Jobe clusters made into ql300 imps
Psychology: 3991 - ql295 Shiny Jobe clusters made into ql300 imps
Chem: 2100 - Alien armor from Mutated
CL: 3991 - ql295 Shiny Jobe clusters made into ql300 imps
B&E: 1400 - ql200 nano rifles
Most of which aren't achievable.