Here is the full list of all 48 Time Survivors achievements.
Kill 10 T-Rexes
Reach level 16 with Mulan in "The Stone Age" stage
Reach minute 5:55 in The Ice Age stage
Complete the Egypt Age stage
Complete "The Egypt Age" stage
Kill the flying Pyramid
Upgrade Plasma Gun to max level during a run
Kill 96 Triceratops
Reach 25% in the Meta progression
Reach Level 66 with Nik in any stage
Use the Red Leech for more than 600 seconds in total
Upgrade Slingshot to max level during a run
Upgrade Amoeba to max level during a run
Find 3 Giga Magnets
Recover 2000 Health Points by any means
Use the Tesla Coil for more than 600 seconds in total
Upgrade Ice Orb to max level during a run
Deal a total of 500.000 damage with any fire weapon
Get 300 gold
Get 5 Apples
Kill 2023 enemies
Defeat 3 Cerberi in a single run
Destroy 20 vases
Meet your first huge monster dog, the Barghest
Survive 6 minutes with Claire
Find 3 Magic Mushrooms
50 Gold turns into 100. Buy upgrades at the Shop!
Upgrade Telescope to maximum level
Kill 222 Evil Priests
Walk 20 Km
Reach Level 5 with any character
Defeat a total of 5000 enemies
Kill 1000 scarabs
Reach minute 14:40 in The Dark Age stage
Death is the way
Reach Level 10 with any character
Play a run in the full "Time Survivors"
Meet the Mortician
Deal a total of 1.000.000 damage with the Shuriken
Survive 5 minutes with Ned
Reach Level 10 with Ned
Complete "The Dark Age" stage
Upgrade Shuriken to max level during a run
Survive 20 minutes with Ned
Survive 20 minutes as Cleo
Reach 50% in the Meta progression
Reach 75% in the Meta progression
Reach 100% in the Meta progression