Hardcore Living/Level Up Rewards

Level	Reward
1	+1 to Max Power (permanently)
4	+1% to Power Restored After Death-Avoidance (permanently)
5	+1 to Max Metabolism (permanently)
6	-10 to Seconds Before Death-Avoidance Resets (permanently)
7	+1 to Max Power (permanently)
8	+2% to Armor Restored After Death-Avoidance (permanently)
9	+1% to Power Restored After Death-Avoidance (permanently)
10	+1 to Inventory Slots (permanently) and +1 to Max Metabolism (permanently)
11	+1 to Max Power (permanently)
12	-10 to Seconds Before Death-Avoidance Resets (permanently)
14	+1% to Power Restored After Death-Avoidance (permanently)
15	+1 to Max Metabolism (permanently)
17	+1 to Max Power (permanently)
18	+2% to Armor Restored After Death-Avoidance (permanently) and -10 to Seconds Before Death-Avoidance Resets (permanently)
19	+1% to Power Restored After Death-Avoidance (permanently)
20	+1 to Inventory Slots (permanently) and +1 to Max Metabolism (permanently)
21	+1 to Max Power (permanently)
24	-10 to Seconds Before Death-Avoidance Resets (permanently) and +1% to Power Restored After Death-Avoidance (permanently)
25	+1 to Max Metabolism (permanently)
27	+1 to Max Power (permanently)
28	+2% to Armor Restored After Death-Avoidance (permanently)
29	+1% to Power Restored After Death-Avoidance (permanently)
30	+1 to Inventory Slots (permanently), -10 to Seconds Before Death-Avoidance Resets (permanently), and +1 to Max Metabolism (permanently)
31	+1 to Max Power (permanently)
34	+1% to Power Restored After Death-Avoidance (permanently)
35	+1 to Max Metabolism (permanently)
36	-10 to Seconds Before Death-Avoidance Resets (permanently)
37	+1 to Max Power (permanently)
38	+2% to Armor Restored After Death-Avoidance (permanently)
39	+1% to Power Restored After Death-Avoidance (permanently)
40	+1 to Inventory Slots (permanently) and +1 to Max Metabolism (permanently)
41	+1 to Max Power (permanently)
42	-10 to Seconds Before Death-Avoidance Resets (permanently)
44	+1% to Power Restored After Death-Avoidance (permanently)
45	+1 to Max Metabolism (permanently)
47	+1 to Max Power (permanently)
48	+2% to Armor Restored After Death-Avoidance (permanently) and -10 to Seconds Before Death-Avoidance Resets (permanently)
49	+1% to Power Restored After Death-Avoidance (permanently)
50	+1 to Inventory Slots (permanently) and +1 to Max Metabolism (permanently)
51	+1 to Max Power (permanently)
54	-10 to Seconds Before Death-Avoidance Resets (permanently) and +1% to Power Restored After Death-Avoidance (permanently)
55	+1 to Max Metabolism (permanently)
57	+1 to Max Power (permanently)
58	+2% to Armor Restored After Death-Avoidance (permanently)
59	+1% to Power Restored After Death-Avoidance (permanently)
60	+1 to Inventory Slots (permanently), -10 to Seconds Before Death-Avoidance Resets (permanently), and +1 to Max Metabolism (permanently)
61	+1 to Max Power (permanently)
64	+1% to Power Restored After Death-Avoidance (permanently)
65	+1 to Max Metabolism (permanently)
66	-10 to Seconds Before Death-Avoidance Resets (permanently)
67	+1 to Max Power (permanently)
68	+2% to Armor Restored After Death-Avoidance (permanently)
69	+1% to Power Restored After Death-Avoidance (permanently)
70	+1 to Inventory Slots (permanently) and +1 to Max Metabolism (permanently)
71	+1 to Max Power (permanently)
72	-10 to Seconds Before Death-Avoidance Resets (permanently)
74	+1% to Power Restored After Death-Avoidance (permanently)
75	+1 to Max Metabolism (permanently)
77	+1 to Max Power (permanently)
78	+2% to Armor Restored After Death-Avoidance (permanently) and -10 to Seconds Before Death-Avoidance Resets (permanently)
79	+1% to Power Restored After Death-Avoidance (permanently)
80	+1 to Inventory Slots (permanently) and +1 to Max Metabolism (permanently)
81	+1 to Max Power (permanently)
84	-10 to Seconds Before Death-Avoidance Resets (permanently)
85	+1% to Power Restored After Death-Avoidance (permanently) and +1 to Max Metabolism (permanently)
87	+1 to Max Power (permanently)
88	+2% to Armor Restored After Death-Avoidance (permanently)
89	-10 to Seconds Before Death-Avoidance Resets (permanently) and +1 to Max Metabolism (permanently)
90	+1 to Inventory Slots (permanently) and +1% to Power Restored After Death-Avoidance (permanently)
91	+1 to Max Power (permanently)
95	+1% to Power Restored After Death-Avoidance (permanently) and +1 to Max Metabolism (permanently)
96	-10 to Seconds Before Death-Avoidance Resets (permanently)
97	+1 to Max Power (permanently)
98	+2% to Armor Restored After Death-Avoidance (permanently)
100	+1 to Inventory Slots (permanently), +1% to Power Restored After Death-Avoidance (permanently), and +1 to Max Metabolism (permanently)

From in-game Info tab. Levels 22, 23, 26, 32, 33 not shown in-game; may have no rewards or need verification. Levels 42+ update as you level.