Watch Dogs

There are a total of 52 Skills you'll need to purchase for this achievement. To purchase a Skill you'll need Skill Points which can be obtained by levelling up Aiden, which is done by completing story missions and Acts, taking part in the multiple activities Chicago has to offer, or simply finding collectables.

Not all Skills are available to you from the start as some will require you to complete a certain mission/Act or even has the previous Skill unlocked. The cost of each Skill varies from 1 SP, up to 5. The Skills on offer are also also separated in 4 categories. Below is all 4 and a list, plus to cost of all Skills within them;

Hacking [20 Skills]
Tier 2 Skills require you to start the 'Open Your World' mission to unlock

• Hacker's Tool Kit [Auto Unlock]
• ATM Hack Boost [3 SP]
• Profiler Optimization [Requires ATM Hack Boost / 4 SP]
• ATM Hack Boost Plus [Requires Profiler Optimization / 5 SP]
• Extra Battery [1 SP]
• Extra Battery II [Requires Extra Battery / 3 SP]
• Extra Battery III [Requires Extra Battery II / 5 SP]

• Utilities [Auto Unlock]
• Disrupt Enemy Comms [Complete 'Open Your World' mission / 2 SP]
• Disable Reinforcement Calls [Requires Disrupt Enemy Comms / 5 SP]
• L-Train Control [1 SP]
• Transformers [Requires L-Train Control / 3 SP]

• Traffic Lights [Auto Unlock]
• Gates & Garages [1 SP]
• Bridges [Requires Gates & Garages / 1 SP]
• Steam Pipes [Requires Bridges / 3 SP]
• Disable Helicopter [Requires Gates & Garages / 2 SP]
• Improved Disable Helicopter [Requires Disable Helicopter / 3 SP]
• Blockers [Requires Gates & Garages / 1 SP]
• Road Spikes [Requires Blockers / 2 SP]

Combat [18 Skills]
Tier 2 Skills require you to start the 'Open Your World' mission to unlock

• Focus [1 SP]
• Stealth Sprint [Requires Focus / 4 SP]
• Critical Focus [Requires Stealth Sprint & Complete 1 Criminal Convoy / 5 SP]
• Improved Focus [Requires Focus / 2 SP]
• Slowed Focus [Requires Improved Focus / 3 SP]
• Maximum Focus [Requires Slowed Focus & Complete 10 Chess Puzzles / 5 SP]

• Quick Switch [Catch 1 criminal through the Crime Detection System / 1 SP]
• Pistol Expert [Requires Quick Switch / 2 SP]
• Shotgun Expert [Requires Pistol Expert / 3 SP]
• Sniper Expert [Requires Shotgun Expert / 5 SP]
• Auto Weapons Expert [Requires Shotgun Expert & Reach Wave 5 in NVZN / 5 SP]

• Steady Aim [1 SP]
• Demolitionist [Requires Steady Aim / 3 SP]
• Expert Demolitionist [Requires Demolitionist / 4 SP]
• Enforcer Combat Take Down [Expert Demolitionist / 5 SP]
• Bullet Resistance [Requires Steady Aim / 2 SP]
• Blast Resistance [Requires Bullet Resistance / 3 SP
• Rapid Reload [Requires Blast Resistance & Complete 5 Gang Hideouts / 5 SP

Crafted [8 Skills]
Tier 2 Skills require you to start the 'Open Your World' mission to unlock

• Lure [1 SP]
• Focus Boost [Requires Lure / 2 SP]
• Jam Coms [Requires Lure / 1 SP]
• Blackout [Requires Jam Coms / 1 SP]
• ctOS Scan [Requires Blackout / 3 SP]
• Frag Grenade [Requires Lure / 1 SP]
• IED [Requires Frag Grenade / 2 SP
• Proximity IED [Requires IED / 3 SP]

Driving [6 Skills]
Tier 2 Skills require you to start the 'Open Your World' mission to unlock

• Car Unlock [1 SP]
• Defensive Driver [Requires Car Unlock / 2 SP]
• Precision Driver [Requires Defensive Driver / 3 SP]
• Escape Artist [Requires Precision Driver / 5 SP]
• Off-Road Driver [Requires Defensive Driver / 3 SP]
• Offensive Driver [Requires Off-Road Driver & Complete 5 Fixer Contracts / 5 SP]

You can view how many you have left if you bring up your Smartphone, select the 'Statistics' App and then press to access the 'Progression' menu.