Meet the indicated requirement to unlock the corresponding medal and it's subsequent tiers.

Builder (Bronze):
Deploy 2,000 Resonators

Builder (Gold):
Deploy 30,000 Resonators

Builder (Onyx):
Deploy 200,000 Resonators

Builder (Platinum):
Deploy 100,000 Resonators

Builder (Silver):
Deploy 10,000 Resonators

Connector (Bronze):
Link 50 Portals

Connector (Gold):
Link 5,000 Portals

Connector (Onyx):
Link 100,000 Portals

Connector (Platinum):
Link 25,000 Portals

Connector (Silver):
Link 1,000 Portals

Engineer (Bronze):
Deploy 150 Mods on Portals

Engineer (Gold):
Deploy 5,000 Mods on Portals

Engineer (Onyx):
Deploy 50,000 Mods on Portals

Engineer (Platinum):
Deploy 20,000 Mods on Portals

Engineer (Silver):
Deploy 1,500 Mods on Portals

Explorer (Bronze):
Visit and hack 100 unique Portals

Explorer (Gold):
Visit and hack 2,000 unique Portals

Explorer (Onyx):
Visit and hack 30,000 unique Portals

Explorer (Platinum):
Visit and hack 10,000 unique Portals

Explorer (Silver):
Visit and hack 1,000 unique Portals

Guardian (Bronze):
Control a Portal for 3 consecutive days

Guardian (Gold):
Control a Portal for 20 consecutive days

Guardian (Onyx):
Control a Portal for 150 consecutive days

Guardian (Platinum):
Control a Portal for 90 consecutive days

Guardian (Silver):
Control a Portal for 10 consecutive days

Hacker (Bronze):
Hack 2,000 Portals

Hacker (Gold):
Hack 30,000 Portals

Hacker (Onyx):
Hack 200,000 Portals

Hacker (Platinum):
Hack 100,000 Portals

Hacker (Silver):
Hack 10,000 Portals

Illuminator (Bronze):
Capture 5,000 Mind Units via Control Fields

Illuminator (Gold):
Capture 250,000 Mind Units via Control Fields

Illuminator (Onyx):
Capture 4,000,000 Mind Units via Control Fields

Illuminator (Platinum):
Capture 1,000,000 Mind Units via Control Fields

Illuminator (Silver):
Capture 50,000 Mind Units via Control Fields

Liberator (Bronze):
Capture 100 Portals

Liberator (Gold):
Capture 5,000 Portals

Liberator (Onyx):
Capture 40,000 Portals

Liberator (Platinum):
Capture 15,000 Portals

Liberator (Silver):
Capture 1,000 Portals

Mind Controller (Bronze):
Create 100 Control Fields

Mind Controller (Gold):
Create 2,000 Control Fields

Mind Controller (Onyx):
Create 40,000 Control Fields

Mind Controller (Platinum):
Create 10,000 Control Fields

Mind Controller (Silver):
Create 500 Control Fields

Mission Day (Bronze):
Successfully attend 1 Mission Day

Mission Day (Gold):
Successfully attend 6 Mission Days

Mission Day (Onyx):
Successfully attend 20 Mission Days

Mission Day (Platinum):
Successfully attend 10 Mission Days

Mission Day (Silver):
Successfully attend 3 Mission Days

Pioneer (Bronze):
Capture 20 unique Portals

Pioneer (Gold):
Capture 1,000 unique Portals

Pioneer (Onyx):
Capture 20,000 unique Portals

Pioneer (Platinum):
Capture 5,000 unique Portals

Pioneer (Silver):
Capture 200 unique Portals

Purifier (Bronze):
Destroy 2,000 enemy Resonators

Purifier (Gold):
Destroy 30,000 enemy Resonators

Purifier (Onyx):
Destroy 300,000 enemy Resonators

Purifier (Platinum):
Destroy 100,000 enemy Resonators

Purifier (Silver):
Destroy 10,000 enemy Resonators

Recharger (Bronze):
Recharge Portals with 100,000 Exotic Matter

Recharger (Gold):
Recharge Portals with 3,000,000 Exotic Matter

Recharger (Onyx):
Recharge Portals with 25,000,000 Exotic Matter

Recharger (Platinum):
Recharge Portals with 10,000,000 Exotic Matter

Recharger (Silver):
Recharge Portals with 1,000,000 Exotic Matter

Recruiter (Bronze):
Recruit 1 new player into Ingress and help them reach level 3

Recruiter (Gold):
Recruit 25 new players into Ingress and help them reach level 3

Recruiter (Onyx):
Recruit 100 new players into Ingress and help them reach level 3

Recruiter (Platinum):
Recruit 50 new players into Ingress and help them reach level 3

Recruiter (Silver):
Recruit 10 new players into Ingress and help them reach level 3

Sojourner (Bronze):
Hack a Portal in consecutive 24 hour periods for 15 straight days

Sojourner (Gold):
Hack a Portal in consecutive 24 hour periods for 60 straight days

Sojourner (Onyx):
Hack a Portal in consecutive 24 hour periods for 360 straight days

Sojourner (Platinum):
Hack a Portal in consecutive 24 hour periods for 180 straight days

Sojourner (Silver):
Hack a Portal in consecutive 24 hour periods for 30 straight days

SpecOps (Bronze):
Complete 5 unique Missions

SpecOps (Gold):
Complete 100 unique Missions

SpecOps (Onyx):
Complete 500 unique Missions

SpecOps (Platinum):
Complete 200 unique Missions

SpecOps (Silver):
Complete 25 unique Missions

Translator (Bronze):
Accrue 200 points from Glyph hacking

Translator (Gold):
Accrue 6,000 points from Glyph hacking

Translator (Onyx):
Accrue 50,000 points from Glyph hacking

Translator (Platinum):
Accrue 20,000 points from Glyph hacking

Translator (Silver):
Accrue 2,000 points from Glyph hacking

Trekker (Bronze):
Walk a total of 10 kilometers while playing Ingress

Trekker (Gold):
Walk a total of 300 kilometers while playing Ingress

Trekker (Onyx):
Walk a total of 2,500 kilometers while playing Ingress

Trekker (Platinum):
Walk a total of 1,000 kilometers while playing Ingress

Trekker (Silver):
Walk a total of 100 kilometers while playing Ingress